The history of the origin of turtles. Identification of the type of domestic turtle Turtle amphibian

Turtles (lat. Testudines) are representatives of one of the four orders of modern reptiles belonging to the phylum Chordata. The age of fossil remains of turtles is 200-220 million years. is 200-220 million years.

Description of the turtle

According to most scientists, the appearance and structure of turtles have remained virtually unchanged over the past 150 million years.

Appearance

Main hallmark turtle is the presence of a shell, represented by a very complex bone-leathery formation, covering the body of the reptile from all sides and protecting the animal from the attacks of numerous predators. The inner part of the shell is characterized by the presence of bone plates, and the outer part is characterized by leathery scutes. This shell has a dorsal and abdominal part. The first part, called the carapace, is distinguished by a convex shape, and the plastron, or abdominal part, is always flat.

This is interesting! The turtle body has a strong fusion with the shell part, from which the head, tail and limbs protrude between the plastron and carapace. When any danger arises, turtles are able to completely hide inside their shell.

The turtle has no teeth, but has a beak, pointed at the edges and quite strong, allowing the animal to easily bite off pieces of food. Turtles, along with some snakes and crocodiles, lay leathery eggs, but the reptiles most often do not care for their hatched offspring, so they almost immediately leave the laying site.

Turtles of different species differ greatly in their size and weight. For example, the length of a land spider turtle does not exceed 100 mm with a weight in the range of 90-100 g, and the size of an adult sea leatherback turtle reaches 250 cm and weighs more than half a ton. Among the currently known land tortoises, the category of giants includes the Galapagos elephant tortoises, whose shell length exceeds a meter and can weigh four hundredweight.

The color of turtles, as a rule, is very modest, allowing the reptile to easily camouflage itself with objects in the environment. However, there are also several types that are distinguished by a very bright and contrasting pattern. For example, the radiated tortoise in the central part of the shells has a characteristic dark background with bright yellow spots and numerous outgoing rays located on it. The head and neck area of ​​the red-eared slider is decorated with a pattern of wavy lines and stripes, and behind the eyes there are spots of bright red color.

Character and lifestyle

Even despite the insufficient level of brain development, as a result of testing it was possible to determine that the turtle’s intelligence shows fairly high results. It should be noted that not only land turtles, but also many freshwater species of turtles, including European marsh and Caspian turtles, took part in such experiments.

Turtles are reptiles that lead a solitary lifestyle, but such animals need the company of their own kind with the onset of mating season. Sometimes turtles gather for the wintering period in not too numerous groups. For some freshwater species, including toad-headed turtles (Phrynops geoffroanus), are characterized by an aggressive reaction to the presence of their relatives, even outside the mating season.

How long do turtles live?

Almost all existing species of turtles deservedly belong to the category of long-lived record holders among numerous vertebrates.

This is interesting! The well-known Radiant Tortoise of Madagascar, named Tui Malila, managed to live for almost two hundred years.

The age of such a reptile often exceeds a century. According to scientists, a turtle can live even two hundred years or more.

turtle shell

The turtle's carapace is distinguished by a convex shape, represented by a bone base and a horny covering. The bony base of the carapace consists of eight presacral vertebrae, as well as the dorsal costal sections. Typical turtles have fifty plates of mixed origin.

The shape and number of such scutes are a very important feature that allows us to determine the species of a turtle:

• land species usually have a high, convex and very thick upper armored shield, which is associated with general intestinal volume indicators. The dome-shaped shape provides significant internal space, facilitating the digestion of plant roughage;
• burrowing land species have a more flattened, elongated carapace, which helps the reptile easily move inside the burrow;
• Various freshwater and sea turtles are most often characterized by the presence of a flattened, smooth and streamlined carapace, which has an oval, ovoid or teardrop shape, but the bone base may well be reduced;
• soft-bodied species of turtles are distinguished by a very flat carapace, the bone base of which is always quite strongly reduced in the absence of horny scutes and the presence of a leathery covering on the shell;
• The carapace in leatherback turtles does not have any fusion with the axial part of the skeleton, therefore it is formed by a mosaic of small bones united with each other, which are covered by the skin;
• Some turtles are distinguished by a carapace in the presence of a well-formed semi-movable joint of the synarthrosis type with cartilaginous tissue at the joints of the plates.

The border of the armored horny scutes can be imprinted on the superficial part of the bony carapace, and the horny carapace, or horny type scutes, have names similar to the located bony plates.

Types of turtles

Currently, more than three hundred species of turtles belonging to fourteen families are known. Some of these peculiar reptiles lead an exclusively land-based lifestyle, while another part is characterized by excellent adaptation to the aquatic environment.

The following species live in our country:

• loggerhead turtles, or carriage turtles, or (lat. Caretta caretta) - reaching a length of 75-95 cm with an average weight in the range of 80-200 kg. The species has a heart-shaped carapace, brownish, red-brown or olive in color. The plastron and bony bridge may be cream or yellowish in color. There are ten costal scutes in the back area, and large scutes also cover the massive head. The front flippers are equipped with a pair of claws;
• leatherback turtles, or loot(lat. Dermoshelys coriacea) is the only modern species belonging to the family Leatherback turtles (Dermoshelyidae). Representatives are the largest modern turtles, having a body length of 260 cm with a front flipper span of 250 cm and a body weight of up to 890-915 kg;
• Far Eastern turtles, or Chinese Trionics(lat. Pelodiscus sinensis) - freshwater turtles, which are a representative of the Three-clawed family soft-bodied turtles. In Asian countries, meat is widely consumed as food, so reptiles are considered objects for industrial breeding. The length of the carapace of an adult individual, as a rule, does not exceed a quarter of a meter, and the average weight is 4.0-4.5 kg;
• European marsh turtles(lat. Emys orbiсularis) - freshwater turtles with an oval, low and slightly convex, smooth carapace, which has a movable connection with the plastron through a narrow and elastic ligament. The length of an adult individual of this species is 12-35 cm with a body weight of about one and a half kilograms;
• Caspian turtles(lat. Mauremys caspica) - reptiles belonging to the genus Aquatic turtles and the family of Asian freshwater turtles. The species is represented by three subspecies. An adult specimen is characterized by a length of 28-30 cm and an oval-shaped carapace. Juveniles of this species are distinguished by a keeled carapace. Adult males have an elongated carapace with a slightly concave plastron;
• Mediterranean, or Greek, or Caucasian tortoise(lat. Testudo græsa) is a species that has a tall and oval, slightly jagged carapace, 33-35 cm long, light olive or yellowish-brown in color with black spots. The front feet have four or five claws. The back of the thighs is equipped with a horny tubercle. Often a turtle of this species has an unpaired supra-tail shield, the plastron of which is light in color and has dark spots.

On the territory of Kazakhstan and countries Central Asia The Central Asian or steppe tortoise (Agrionemys horsfieldii) is often found. The species is characterized by a low, round, yellowish-brown carapace with vague, dark-colored spots. The carapace is divided by thirteen horny scutes, and the plastron is divided into sixteen scutes. The grooves present on the scutes make it easy to determine the number of years the turtle has lived. Average length turtles do not exceed 15-20 cm, and females of this species, as a rule, are noticeably larger than males.

Range, habitats

The range and habitats of different species of turtles are very diverse:

• Elephant turtle (Сhelonoidis elephantorus) – Galapagos Islands;
• Egyptian tortoise (Testudo kleinmanni) – northern part of Africa and the Middle East;
• (Testudo (Agrionemys) horsfielddii) – Kyrgyzstan and Uzbekistan, as well as Tajikistan and Afghanistan, Lebanon and Syria, northeastern Iran, northwestern India and Pakistan;
• or ( Geochelone pardalis) – African countries;
• Speckled cape tortoise (Homophorus Signatus) – South Africa and South part Namibia;
• Painted or decorated turtle (Сhrysemys pista) – Canada and USA;
• (Emys orbiсularis) – countries of Europe and Asia, the territory of the Caucasus;
• or ( Trachemys scripta) – USA and Canada, northwestern South America, including northern Colombia and Venezuela;
• (Сhelydra serpentina) – USA and southeastern Canada.

The inhabitants of the seas and oceans include Real carriage (Eretmoshelys imbricata), (Dermochelys coriacea), Green soup turtle (Сhelonia mydas). Freshwater reptiles live in rivers, lakes and swamps of the temperate Eurasian zone, and also inhabit reservoirs in Africa, South America, Europe and Asia.

Turtle diet

The food preferences of turtles directly depend on the species characteristics and habitat of such a reptile. The basis of nutrition for land turtles is represented by plant foods, including young branches different trees, vegetable and fruit crops, grass and mushrooms, and to replenish the amount of protein, such animals eat snails, slugs or worms. The need for water is often satisfied by eating the succulent parts of plants.

Freshwater and sea turtles can be classified as typical predators, feeding on small fish, frogs, snails and crustaceans, bird eggs, insects, various mollusks and arthropods. Plant foods are eaten in small quantities. Herbivorous individuals are also characterized by eating animal food. There are also species of freshwater turtles that switch to plant foods as they grow older. Omnivorous sea turtles have also been well studied.

Reproduction and offspring

With the onset of the mating season, adult male turtles organize traditional tournament fights and fights among themselves for the right to mate with the female. At such times, land turtles chase their opponent and try to turn him over by biting or hitting him with the front part of his shell. In fights, aquatic species prefer biting and chasing their opponents. Subsequent courtship allows the female to take the most comfortable position for mating.

Males belonging to some species are capable of making rather primitive sounds during the mating process. All known species modern turtles are oviparous animals, so females lay eggs inside a pitcher-shaped hole dug with their hind legs and moistened with the liquid secreted by the cloaca.

The hole with white spherical or elliptical eggs is filled up, and the soil is compacted using plastron blows. Sea turtles and some side-necked turtles lay eggs covered with a soft, leathery shell. The number of eggs varies among representatives of different species and can range from 1 to 200 pieces.

This is interesting! Giant tortoises (Megalochelys gigantea) have behavioral mechanisms that regulate population size by the number of eggs laid annually.

Many turtles lay several clutches during one season, and the incubation period, as a rule, lasts from two months to six months. An exception that takes care of its offspring is the brown turtle (Manouria emys), the females of which guard the nest with oviposition until the babies are born. Also interesting is the behavior of the Bahamian ornamented turtle (Pseudemys malonei), which digs up the oviposition and facilitates the release of the young.

One of the most interesting units The turtle is rightfully considered a reptile. Scientists who studied ancient remains in order to find out how many years she had been living on the planet found that their existence on Earth lasted more than 220 million years. These are rare animals that can live on land and in water. The turtle is a reptile that has 328 species, grouped into 14 families.

Origin of the name

If we consider the Slavic and Latin origins of the name of the reptile, it is easy to see the commonality. Both languages ​​demonstrate a response to appearance in the word: translated from Latin “tile”, “clay vessel”, “brick”; from Slavic - “shard”.

Indeed, many turtles resemble the stone for which the people who gave them this name mistook them. Despite this etymology of the name, it also contains an indication of the unique shape and color of the hard shells.

What do turtles look like?

In the diversity of turtle species, there are common characteristics for all that unite them into one order.

The main distinguishing feature of the order is the shell, which absolutely all representatives have. It consists of a carapace (dorsal) and plastron (abdominal), connected to each other. This durable device serves, first of all, to protect the animal from enemies. When necessary, the turtle is fully capable of hiding its body and head in it, lowering its upper part and remaining protected from any attack on it.

The shells are covered with hard horny scutes, different in color and shape depending on the species. There are holes into which the paws, head, and tail extend and retract as needed.

The strength of the shell, as studies have shown, is so great that it can withstand a weight exceeding the weight of the animal by 200 times.

Reptiles molt periodically: the old skin peels off from their shell in scales, and the color becomes brighter.

How much does a turtle weigh? Turtle sizes

The turtle is a unique reptile. Some species can reach gigantic sizes - up to 2 meters, and weigh up to a ton. But there are also tiny representatives whose weight does not exceed 120 grams and size - 10 cm.

Each type of turtle has its own parameters, which we will talk about, characterizing them separately.

Paws

All species have four paws, which can be hidden in the shell if necessary.

The structure depends on the lifestyle and species. Terrestrial animals are distinguished by thickened front paws, suitable for digging soil, and powerful hind paws, which help to move along the surface. river turtle, living in fresh water, has membranes between its toes. The sea turtle, evolving, acquired fins instead of paws, and the front ones are much larger than the back ones.

Tail

Almost everyone has a tail, the length of which depends on the species and lifestyle. If necessary, the tail can be retracted into the shell.

For swimming reptiles, it serves as a kind of rudder that helps maneuver in the water, and is more developed than that of its land-based counterparts.

Head and neck

All turtles have a medium-sized head with a streamlined shape. When danger arises, many representatives of this class hide their heads in their shells. But there are turtles that have a fairly large head and cannot retract it.

Depending on the species, the front of the head can be elongated or flat, but it always ends with the nostrils.

The eyes are also positioned differently: in reptiles living on land, they are directed downward, while in swimming reptiles they are directed much higher. Animals have excellent vision and see this world in color.

Some turtles have quite long necks. In other representatives they are of medium size and are perfectly retracted into the shell if necessary.

Sometimes these animals, sticking their heads out of the water, are mistaken for huge snakes.

In many representatives of the species, the oral part begins with a hard beak-shaped process, with which they easily bite off even the hardest food and are able to catch prey. The edges of these processes can be either sharp or jagged.

But they don't have teeth. The chewing movements that reptiles make are necessary in order to move food into the pharynx. Language also helps them with this.

Despite the lack of teeth, turtles have powerful jaws that can handle almost any food.

Sexual characteristics of a turtle

The sex of turtles is determined by appearance and behavior, since these animals do not have clear genital differences, and it is almost impossible to figure out the sex at first glance. However, males differ from females:

• according to the shape of the shell (in females it is more elongated);
• the lower part of the shell is slightly concave in males, flat in females;
• the tail of males is longer, wider and thicker, it is more curved down;
• according to the shape of the anus;
• in males, the claws of the front paws are slightly longer;
• a small notch in the shell in the tail area is present only in males;
• The behavior of males is characterized by activity.

In some species, gender, in addition to the indicated characteristics, is expressed by the color or shape of the head.

In nature, these reptiles are completely herbivorous, carnivorous and omnivorous. Most eat both plant and animal foods.

Lifespan

On average in wildlife turtles live about 20-30 years. But it depends on the type of reptile. There are centenarians who can reach 200 years of age. As a rule, turtles live longer in captivity, but this also depends on the species and conditions of detention.

Types of turtles

The long stay of representatives of this order on the planet allowed them to divide into 328 species, differing external signs, size, habitat, nutrition and lifestyle.

The classification involves the division of reptiles, depending on how they hide their heads in the shell, into cryptonecks and side-necks. The first group presses their head into the shell by contracting the neck muscles. The second is folded to the side, under one of the front paws.

Another classification is based on the habitat of these reptiles:

• sea ​​turtle - lives in the salty waters of the seas and oceans;
• terrestrial - capable of living both on the surface of the earth and in fresh waters; this variety, in turn, is divided into freshwater and land.

This sea turtle chose the waters of the Atlantic, Pacific and even Indian oceans for its life.

There are two subspecies of these reptiles: Atlantic and eastern Pacific. Its elongated shell can be not only green, but also dark brown with yellow and white stripes or spots.

Reptiles got their name not from their external coloring, but from the color of the meat they ate.

The green turtle is one of the largest species. The length of its shell can reach up to 2 m, and its weight can reach 400 kg.

Juveniles live exclusively in water, where they feed small fish, mollusks, jellyfish. Adult reptiles come ashore, where they begin to feed on plant foods, which over time become their main diet.

The tasty meat of these animals was traditionally used for food (they are even called soup animals), which led to a decline in the population. Hunting them is currently prohibited in many countries.

The onset of puberty occurs after 10 years, sometimes much later. Reptiles mate in water, but lay their clutches on the shore, in the same places where their predecessors laid eggs. They dig very large holes in which they place up to 200 eggs. Small turtles, hatching, run towards the water. If they managed to get there, they will spend many years in the ocean, until the moment comes when they themselves have to go ashore to give birth.

If your pet is a sea turtle, keep in mind that caring for it at home is much more difficult than for land-based ones, since you need to have spacious aquariums with water adapted for the reptile.

Another name for this species is Chinese trionix, or chinese tortoise. The Far Eastern turtle prefers to live on the silt-covered bottom of large lakes and rivers with gently sloping overgrown banks. Their habitat is Primorye, the southern part of the Amur in Russia, Vietnam, China, Japan, Korea and Taiwan.

The Far Eastern turtle is green-brown or green-gray in color with pale yellowish spots. Its usual size is about 30 cm, but there have been specimens up to 40 cm and weighing more than 4 kilograms. They have fleshy lips covering strong jaws.

The shell of these animals in young individuals has a rounded shape. It becomes flatter with age. Distinctive feature young individuals have a bright orange abdomen, the color of which becomes pale over time.

The Chinese turtle is capable of hunting both in water and on land, where it goes out to bask in the sun. These reptiles hibernate by burying themselves in the mud.

The diet of these predatory reptiles consists of fish, shellfish, amphibians and insects. Your prey Far Eastern turtle can guard for a long time, buried in the mud.

At the age of 6-7 years, the Far Eastern tortoise becomes sexually mature. Usually in July they lay eggs at a short distance from the water. During the season, the female makes several clutches, from which about 70 turtles emerge. After 1.5 - 2 months, babies appear, the size of which is no more than 3 cm. They quickly run to the water and hide for a long time in coastal vegetation and between stones.

The Far Eastern tortoise has enough aggressive character and can severely bite its attacker.

If this turtle lives in a house from an early age, it easily gets used to a person and can even feed from his hands.

Living in the southeast of Eurasia, this steppe loves wet areas in river valleys, foothills, agricultural lands, sandy and clay semi-deserts. Animals dig holes or occupy empty ones.

Observations shed light on how many years this turtle lives. It turns out that life expectancy depends on its activity. At home in a closed terrarium, it is unlikely to overcome the 15-year mark, when in the wild it can live for 30 years. Not in natural environment The Central Asian turtle, even if care and nutrition are as close as possible to natural ones, lives significantly less.

The Central Asian tortoise does not grow more than 20 cm, while males are slightly smaller in size than females.

This steppe turtle hibernates quite early: at the beginning of summer, immediately after laying eggs. This is due to the fact that this particular time in their habitat is the driest. Lack of food in sufficient quantities forces them to wait out in a state of sleep.

The Central Asian turtle has a very beautiful shell - reddish-olive with dark round spots.

Reptiles of this species are dark brown, dark olive, almost black in color with small yellow streaks or spots. A distinctive feature is a very long tail and the absence of a beak.

The habitat of these animals is unusually wide: they can be found in the European part of Russia, the Caucasus, Bashkiria, Kazakhstan, Turkmenistan and even in northwest Africa. They prefer forest, forest-steppe and steppe areas, the banks of slow-flowing rivers, and wetlands.

These reptiles are found in mountainous areas at altitudes of up to 1500 meters above sea level.

It is impossible to say that this is an aquatic turtle. She prefers to get out onto land quite often and moves relatively quickly along it.

The diet of representatives of this species is unusually wide: it eats worms, mollusks, small reptiles, fish, and chicks of waterfowl. She does not disdain carrion.

Depending on the region, they become sexually mature at the age of 5-9 years. Eggs are laid near water bodies. The sex of the offspring depends on temperature. When the levels are high, females are born, while when they are low, males are born.

Unfortunately, the clutches are attacked by predators (foxes, raccoons, otters, crows), who are happy to feast on both the eggs themselves and the small turtles.

Another name for these reptiles is directly related to their habitat - Seychelles giant turtle. This terrestrial animal is endemic to Aldabra Island.

The size of the shell of this large animal reaches a meter. It flaunts clearly defined shell segments, has fairly large legs that help it move on land, and a relatively small head.

Given its size, the reptile is a herbivore. Everything a turtle eats grows around it. She happily eats all low-growing bushes and grass.

There are currently only 150,000 left in the wild, so the reptile is protected. On the island where they live, not only hunting is prohibited, but also any economic activity.

Reptiles lay eggs from May to September, and they are able to regulate the population size: if there was not enough food, their clutches will contain only 5-6 eggs.

Is the most major representative your squad. These reptiles live only on the Galapagos Islands and are not found anywhere else. Their weight sometimes exceeds 400 kg, and the length of the shell reaches 2 m. They have fairly muscular paws, which have sharp claws (5 on the front and 4 on the hind). In case of danger, they pull their head and limbs into the shell.

At the end of the 20th century, the population of these animals decreased to 3,000 individuals, which became critical, so a decision was made to protect the reptiles.

Currently, there are two varieties of these reptiles, differing in habitat (relatively small individuals live in arid areas), size, color and shape of the shell.

Scientists actively studying the life of Galapagos endemics have identified interesting facts about turtles of this species: for example, the fact that they can eat poisonous plants that no other animal eats. In some cases, they are able to live for several months without food or fresh water.

Mating and laying of eggs of these giants occurs at any time of the year, but peaks of activity occur in certain seasons.

This reptile is also called the yellow-bellied reptile. The water turtle received its original names solely for the bright accents in its color: there is a red spot on its head, and its abdomen is yellow.

There are 15 subspecies of these reptiles belonging to the American freshwater family.

The size of the animal depends on the subspecies and gender - from 18 to 30 cm, with males slightly smaller than females.

Its main habitat is America, but its presence is also noted in Europe (Spain and England), northern Africa, and Australia. For their life, they choose swampy areas with low banks, since this river turtle loves to get ashore and bask in the sun.

In Australia, the water turtle is considered a pest and its numbers are controlled.

The water turtle lays its eggs on land, where it digs out a spherical nest and places up to 20 eggs there. Reptiles of this species do not care about their offspring.

The water turtle feeds on insects, small fish, and worms. She chews her food with her head completely immersed in the water. If you have a water turtle living in your home, care and feeding should be consistent with its natural needs.

We have long found out how many years a turtle lives at home. If the maintenance and care are natural, it can easily live for half a century. In nature, this age is somewhat less.

One of the subspecies is the yellow-eared turtle. As the name suggests, its main decoration is bright color shell and a yellow spot in the area of ​​the auricle.

The yellow-eared turtle differs from its red-eared counterparts only in color. Their habitat, diet and reproduction are identical.

The yellow-eared turtle thrives at home. Maintenance and care do not require much time and do not cause much trouble for the owners.

Small in size (the maximum length of the shell is no more than 13.5 cm), the reptile has chosen the American continents.

Its dirty-brown shell has three longitudinal ridges, and light stripes are visible on its head.

It lives in small rivers with silted banks, where this river turtle hunts and lays eggs.

When the water temperature drops below 10 degrees, the reptile begins to dig a hole for hibernation. Unlike many species, muskies can sleep in groups. The period of sleep itself depends not on the season, but on the temperature: in the southern regions, where there are no low temperatures, this reptile is active throughout the year and does not hibernate.

If you have a musk turtle in your home, keeping it alone is not advisable. It is better to have several individuals at once. This will affect how many years the turtle lives at home.

The musk turtle is quite common in home aquariums; keeping, feeding and caring for it does not require much effort.

Where do turtles live? Habitat

Reptiles of this order live on almost all continents of the world. The only exceptions are Antarctica and desert areas, the climate of which is completely unsuitable for these animals. Any coast - be it the oceans or small rivers and lakes - can boast of its own view, or even more than one.

They find food almost everywhere: it can be insects, worms, small fish, crustaceans and vegetation. Its unpretentiousness in food makes the reptile able to survive in almost any place.

Even in reservoirs located in large cities, you can find these animals. They go ashore to bask in the sun. During the breeding season, you can come across clutches of their eggs on deserted beaches.

A turtle is a reptile that has long settled in homes, becoming a favorite pet. Home care for this reptile is insignificant, so many people choose them for their home.

How many years a turtle lives at home, first of all, depends on the species, age of the animal that comes to you, and the conditions in which it will live. Comfortable existence and feeding as close as possible to natural habitat conditions will allow your pet to live long enough. If the turtle feels good in the house, and the maintenance and care are appropriate, then it can live up to 50 years.

Which turtle is best for a home?

Usually river reptiles become pets. A river turtle, once at home, adapts quite quickly. Its maintenance does not require an overly spacious aquarium, but it is very important to equip it correctly, creating a swimming area and dry land for your pet to go to when necessary.

• water (red-eared and yellow-eared);
• European (swamp);
• Central Asian (steppe);
• Far Eastern;
• musk turtle.

Keeping sea turtles in home aquariums is very problematic. Even young individuals require special water, reminiscent of ocean water. And for older adults, very spacious tanks are needed, since confined spaces the animal will not be able to be active enough, and this also determines how many years the turtle lives at home.

Before purchasing an animal, get acquainted with useful information about it. Temperature, nutrition and care, activity and the ability to live alone or in pairs are very important for the reptile.

What does a turtle prefer to eat at home?

If you have a pet turtle, its nutrition, maintenance and care should resemble its natural lifestyle. Before adopting a pet, study what it eats in nature and during what periods it is active.

Young individuals, as a rule, consume 70 percent of live food (food worms, insects, small crustaceans). Growing up, they switch almost completely to plant foods. Suitable for feeding:

• vegetables and their tops (tomatoes, peppers, pumpkin, carrots, and occasionally cucumbers);
• berries (strawberries, wild strawberries, watermelon);
• fruits (plums, peaches, apples, bananas).

Do not overfeed the animal! If you see that there is food left after feeding, be sure to remove it and subsequently reduce the portions.

If you have a turtle at home, caring for it must necessarily include cleaning the aquarium. Be especially attentive to leftover food: stale food can lead to intestinal upset, which will affect how many years a turtle lives at home.

• Representatives of this order of amphibians can boast that they have left their mark on the history of astronautics. Two individuals of the Central Asian tortoise species were the first among animals to fly around the Moon and return alive to Earth.
• The meat of these animals is a delicacy. But some species are not recommended for consumption. This happens because sometimes this turtle eats poisonous mushrooms or jellyfish. They do not eat the meat of box turtles, leatherback turtles and hawksbill turtles.
• Reptiles of this order can swim well and move on land. But the European tortoise can also be called a jumping tortoise. She can jump into the water from three-meter mountain ledges.
• Turtles have their own long-lived lives. So in 2006, the oldest turtle, Advaita, died, whose age, according to experts, was more than 150 years.
• Many people wonder how long a turtle can live without food. In the natural environment, determining this time is quite difficult. But for pets, this is a maximum of 3 weeks, taking into account the fact that the animal is hibernating. In nature, the sleep period can last several months. It is believed that at this time the reptile does not eat at all.
• During the period of courtship and mating, sea turtles stick their heads out of the water and make drawn-out sounds similar to howls.

Everyone associates turtles with the eternal slowness characteristic of these reptiles, but not everyone knows that turtles are one of the most ancient representatives of the animal world of our planet. These creatures have been living on Earth for more than 220 million years, yes, they are the same age as extinct dinosaurs. The very name of the word “turtle” comes from the ancient Slavic “shovel”, “tile”, and the Latin name for the turtle is similar – “testa” is translated as “tile”, obviously, the turtles were nicknamed this way due to the similarity of their shells with the tiles themselves.

Turtle: description, structure, characteristics. What does a turtle look like?

Perhaps it is the shell of a turtle that is its most characteristic difference, a kind of turtle business card. For a turtle, it is, in fact, a sort of mobile home + a means of protection from enemies. The turtle shell consists of a dorsal (carapace) and abdominal (plastron) part. The carapace, in turn, consists of two parts, one of which is the internal armor, formed from bone plates, and the second is the outer part, consisting of horny scutes. In some species of turtles, the bony plates are covered with skin.

The shell of a turtle is very durable, so it can easily withstand a load exceeding the weight of the turtle itself by 200 times.

How big are turtles?

The size of a turtle and its weight differ greatly from the species, so in the turtle family there are both giant turtles with a weight of more than 900 kg and a shell size of 2.5 meters or more, and small turtles with a weight of up to 125 grams and a shell size no more than 10 cm.

Head and eyes of a turtle

The turtle's head is streamlined and medium in size. Such dimensions allow turtles, in case of danger, to quickly hide their heads inside an inaccessible shell. Although among them there are also species with big heads, which either fit poorly in the shell or don’t fit at all.

In land turtles, the eyes are usually directed towards the ground, while in aquatic turtles they are located closer to the top of the head and point forward and upward. The neck of many turtles is usually short.

The vision of turtles is well developed, even moreover, turtles, like people, have color vision, can distinguish colors, very few animals have this gift. Nature also gave them excellent hearing, allowing them to hear potential enemies from a distance.

Does a turtle have teeth? How many teeth does a turtle have?

Modern turtles, unfortunately, do not have teeth, but ancient turtles had them, those that lived during the era of dinosaurs, but over time they disappeared. Then how does a turtle eat? To bite and grind food, turtles use a strong beak; the surface of this beak is covered with rough protuberances, which practically replace teeth for turtles. The tongue of turtles is short; it serves exclusively for swallowing food, but not for capturing it, and as a result, does not protrude outward.

Limbs and tails of turtles

All turtles, without exception, have four legs. But the very structure of these paws depends on the type and habitat of the turtle. The paws of land turtles have a flattened shape, they are adapted for digging soil and are quite powerful. In the process of millions of years of evolution, sea turtles' paws have turned into real flippers for the convenience of swimming in the depths of the sea.

Also, almost all turtles have a tail. The tail of a turtle, like its head, is also capable of hiding in its shell. Moreover, what is interesting is that some turtles have a real pointed spike at the tip of their tail, which serves as another means of protection from enemies.

Interesting fact: some land turtles with age they can shed, and their old skin peels off and falls off, both from the paws and sometimes from the shell.

How long do turtles live?

Turtles are truly long-lived even by our human standards, because they live many times longer than us humans. So average duration life of turtles in natural conditions can be 180-250 years.

The oldest turtle in the world, named Jonathan, lives on the island of St. Helena and remembers (probably) the times of Napoleon, because the former emperor of France lived here in exile for some time.

Where do turtles live?

Turtles live in all tropical areas, as well as some places with temperate climates. Sea turtles swim in the warm ocean spaces of the Pacific, Atlantic and Indian Oceans. They are only absent near the Arctic and Antarctica, which is natural, because all turtles love warmth.

Land turtles live in the steppes and semi-deserts of Africa, South and North America, Australia, and Asia. In Europe they can be found in the south, in a number of southern countries: Greece, Italy, Albania.

What do turtles eat in the wild?

The diet of turtles directly depends on their species, habitat and lifestyle. Land turtles are practically vegetarians; their main food is tree branches, fruits and grass, mushrooms and vegetables. However, it was not in vain that we wrote practically, since in order to maintain the protein balance in their bodies, turtles can sometimes eat various small animals such as snails, slugs and worms. Land turtles also drink water with pleasure.

But sea and freshwater turtles are already real predators, since their diet includes various small fish, snails, crustaceans (some sea turtles happily eat squid, cuttlefish and other shrimp). But the gastronomic preferences of aquatic turtles are not limited to living creatures; along with them, they also eat plant foods: algae.

Interesting fact, there are species of sea turtles that eat poisonous jellyfish. From such food, the meat of the turtles themselves, in turn, becomes poisonous, which scares potential predators away from them. This is a gastronomic remedy.

Enemies of turtles

Speaking of enemies, in natural conditions the main enemies of turtles are some birds of prey (eagles), which grab small turtles, lift them to a great height, from there they throw them onto stones and peck out their entrails from their broken shells.

Interesting fact: the great ancient Greek playwright Aeschylus died an extremely ridiculous death, he was killed by a turtle that fell on his head. The eagle, having lifted the turtle to a height, mistakenly considered the playwright's bald head to be a large stone suitable for breaking the turtle's shell.

Death of Aeschylus by an eagle and a turtle.

As for giant turtles, given their weight and size, they have no enemies in nature. Even people are increasingly treating these majestic, long-lived creatures with due respect.

When does a turtle hibernate?

Yes, turtles, like some other animals, tend to hibernate, during which all life processes in their body slow down for a while. This usually happens in winter, and hibernation for heat-loving turtles living in temperate latitudes allows them to survive the winter cold without problems.

How to determine the sex of a turtle

The gender difference in turtles is so weakly expressed in appearance that it is sometimes difficult to determine whether this turtle is a “boy” or a “girl.” However, if you approach this issue with due attention, you can identify a number of signs that help determine the sex of a turtle.

1. Shell; in females the shell has a more elongated shape than in males.

2. Plastron, also known as the lower part of the shell. If you turn the turtle over, you can see that in females the lower part of the shell (the one closest to the anus) is flat, while in males it is slightly concave.

3. Tail, males have a tail that is longer and wider at the base, while “lady turtles” have a straight and short tail.

4. Claws, in males they are usually longer on the forelimbs than in females.

Types of turtles, photos and names

The turtle family is divided into two suborders, divided by the way turtles retract their heads into their shells:

• Hidden-necked turtles fold their heads into shells in the shape of the letter S.
• Side-necked turtles hide their heads in one of their front paws.

Also, according to their habitat, all turtles are divided into land and sea turtles, which in turn are divided into freshwater turtles, living in rivers and lakes, and marine turtles, living in the seas and oceans.

Below we take a closer look at some of the most interesting views turtles.

She's a turtle. These are real giant turtles, weight Galapagos tortoise can exceed 400 kg, the length of the shell reaches up to 1.9 m. These turtles live on the Galapagos Islands, which gave them their name.

This is already a small representative of land turtles, the length of the Egyptian tortoise shell is no more than 10 cm. They have a yellow-brown color of the shell. This turtle lives in northern Africa and the Middle East.

This is a small turtle that lives in Asia, has a rounded shell and is colored yellow-brown with dark spots. The average size of the shell of this turtle is 10 cm. It is also one of the most popular types of turtles for home keeping.

She's a turtle. It is of medium size, the length of the shell is 0.7 m, with a weight of up to 50 kg. The shell of this turtle is high and dome-shaped. The pattern of the shell shows a spotted pattern, similar to the color of a leopard. The leopard tortoise lives in Africa.

It is notable for being the smallest turtle in the world. The length of its shell is no more than 10 cm, with a weight of up to 165 grams. Lives in South Africa.

Types of freshwater turtles

This small turtle lives in waters of the USA and Canada. It has an interesting olive-green or black shell color and leathery membranes between the toes.

This small turtle lives in the waters of Europe and a number of Asian countries; the length of its shell is 35 cm and its weight is 1.5 kg. It has a brown-brown or olive-colored shell, and also a very long tail, like for a turtle.

So named due to the presence of a bright red spot on the head. The length of the shell of this turtle is 30 cm. They live red-eared turtles in both Americas, in the USA, Mexico, Colombia, Venezuela and a number of other countries.

Its characteristic feature is the presence of a cruciform plastron and long tail, covered with small thorns. It is of medium size, the weight of this turtle reaches up to 30 kg. It lives in the USA and southern Canada; it survives the winter cold in hibernation.

Types of sea turtles

She's a real carriage. The shell of this turtle is painted in brown tones with a pattern of multi-colored spots. The front flippers of this turtle are equipped with two claws. This turtle lives in almost all oceans, with the exception of cold waters near the poles.

Notable for being the largest turtle in the world. Only the span of its front flipper-like paws reaches 2.5 meters. Its weight is more than 900 kg, and its shell length exceeds 2.6 meters. The surface of this turtle's shell is covered with a dense layer of skin (hence the name). It lives in tropical regions of the Indian, Atlantic and Pacific oceans.

It is also a rather large turtle, its weight reaches up to 450 kg with a shell length of 1.5 m. It has an olive or green color of the shell, which, however, may have stripes white and dark spots. Its shell is small in height and oval in shape, and its surface is covered with large horny scutes. The head of this turtle is much larger than that of other relatives, and therefore does not hide inside the shell. It lives in tropical areas of the Atlantic and Pacific oceans.

Reproduction of turtles

The mating season for turtles begins at different time depending on the type. However, in all turtles it occurs in a similar way: the males stage real battles for the right to mate with the female. How do turtles fight? It’s very simple, the land ones try to turn the enemy over with a blow from their shell, and the water ones hit and bite each other with their beaks. Only after driving away a potential rival does the male turtle begin courting his “lady,” forcing her to take a position convenient for the actual mating.

Some time after mating, the female turtle lays spherical or ellipsoidal eggs, from which small turtles will be born. Turtles dig special holes for their eggs, and sometimes even use the nests of crocodiles.

From 1 to 200 eggs can be laid at a time (depending on the species). Also the duration incubation period can last from 2 months to six months or more.

After hatching, small turtles begin to struggle for survival; not all of them will survive to adulthood; young turtles are an excellent target for various predators, especially birds of prey.

How to care for a turtle at home

Keeping turtles at home Lately is very popular, and both land and aquatic turtles are kept. And why not, because caring for them is extremely simple, and turtles themselves are unpretentious creatures. True, all of the above is true for small turtles, since keeping large turtles in the house will not be entirely appropriate.

So, what are the rules for caring for turtles? First, in the turtle's habitat, you need to keep a thermometer to monitor the air temperature and a thermometer to monitor the water temperature (if it is an aquatic turtle in an aquarium).

The water in an aquarium for turtles must either be purified using filters, or if there are none, then changed every day. Maintaining hygiene for aquatic turtles involves removing algae from their shells. But land turtles need to be bathed daily in warm water, washing away dirt and food debris. Also, in winter, it is advisable to irradiate turtles a little with the rays of a quartz lamp, thus creating a kind of sunbathing.

What to feed a turtle at home

Turtles need to be provided balanced diet. Land turtles can be fed cabbage, dandelion, apple pulp, cucumbers, and tomatoes. To satisfy the need for protein food, they can be given boiled chicken eggs and vitamin supplements.

Feeding aquatic turtles will be a little more difficult, because they need small animals; you can feed them with dried daphnia, bloodworms, earthworms, boiled chicken or beef. They will not mind eating various insects, cockroaches, and small aquarium fish.

Adult turtles need to be fed once a day, young turtles twice a day and a so-called fasting day once a week.

• It was the turtles that were the first to fly around our moon satellite on board the experimental research probe launched Soviet Union back in 1968.
• Turtle meat is an expensive and delicious product in some cuisines around the world.
• Turtles are also present in heraldry, in the depiction of the coats of arms of some cities.
• Despite the fact that turtles do not pose a danger to humans, there are exceptions, for example, male leatherback turtles can confuse a swimmer with a female, grab them with their paws and drag them to the bottom.
• The sex of turtles in the egg is determined by the ambient temperature. At lower temperatures, males are born, at higher temperatures, females are born.

Turtle, video

And finally, here is an interesting documentary about turtles.

When writing the article, I tried to make it as interesting, useful and high-quality as possible. I would be grateful for any feedback and constructive criticism in the form of comments on the article. You can also write your wish/question/suggestion to my email. [email protected] or on Facebook, sincerely the author.

TURTLES
(Chelonia),
a detachment of reptiles, the only representatives of reptiles whose body is covered with a shell. Found in all warm areas of the world. Several species are inhabitants of the seas and oceans, but mostly they are land and freshwater forms. This group appeared in the Triassic ca. 200 million years ago. It is possible that turtles descended directly from cotylosaurs, the most primitive reptiles. Although there are few fossils to support this hypothesis, the extinct genus Eunotosaurus is a good candidate for being an evolutionary link. This animal had a flattened body and greatly expanded ribs. Unlike their snake relatives, turtles were rarely worshiped and were never particularly feared. Indeed, they pose virtually no danger to human life. Unless a swimmer gets too close to a male leatherback turtle (Dermochelys coriacea) can be grabbed by its strong flippers and drowned. The fact is that in a state of strong sexual arousal, he is able to mistake any large object for a female.
Anatomy. The torso of turtles is enclosed in a shell, which also partially protects the head, neck and limbs. Its upper part, or carapace, covers the back and sides of the reptile, the lower, or plastron, covers the stomach. The shell is so strong that it can withstand 200 times the weight of the owner. Typically, the inner layer of the shell is bone, and the outer layer is formed by hard horny tissue. Both layers consist of many elements tightly fitted to each other. The bony elements are called laminae, and the horny elements are called scutes. The greater strength of the shell is partly ensured by the fact that the boundaries between the internal plates and the outer scutes do not coincide. As the turtle increases in size, horny substance grows along the edges of each scute. If growth is interrupted by periods of hibernation, growth rings are clearly visible on the scutes, allowing one to estimate the age of the individual. The ribs are fused to the shell, so the chest is motionless. As a result, the turtle's breathing resembles the diaphragmatic breathing characteristic of humans and other mammals. Special muscles retract internal organs back, allowing the lungs to fill with air; then other muscles carry out the reverse process, compressing the lungs. Some aquatic species are not completely dependent on pulmonary respiration and are able to absorb oxygen also through the mucous membrane of the pharynx. Differences between males and females (sexual dimorphism) are expressed differently depending on the species; sometimes they are completely invisible. A comparison of males and females of other species shows that the former have a longer and thicker tail, and the anus is located further from its base. This dimorphism is especially pronounced in huge sea turtles. Other sex differences concern the shape of the plastron, the color and size of the head, and the overall dimensions of the body.
Mating and egg laying. Mating behavior begins with courtship, the forms of which are very species specific. The male may butt and push the female while gently biting her. In large turtles, courtship is sometimes accompanied by loud grunting. Male painted turtles (Chrysemys picta) and ornamented turtles (Pseudemys) display affection in a special way. Swimming backwards and dragging the female along with them, they stroke or pat her on the face with the long claws of their front paws. Mating can take place on land or in water. In this case, the penis, hidden at the base of the tail in a calm state, extends through the opening of the cloaca. Females of some turtle species can store viable sperm for a long time (this is also true of some other vertebrates), and one mating allows them to lay fertilized eggs over the next several years. However, their number decreases every year until a new portion of sperm is obtained. Turtle eggs are oval or round, white or almost white. Females bury them in the ground to a depth not exceeding the length of their hind legs, or hide them in a pile of rotting plants. Most often these are well-lit places. Usually there is one clutch per year, but some sea turtles have as many as seven clutches in one breeding season. Depending on the type, eggs in a clutch range from one to 200.
Hatching. The period of incubation and hatching is the most dangerous in the life of turtles; at this time, numerous enemies feast on their delicious eggs and still soft-bodied babies. Mammals dig up clutches, and seabirds They grab newly hatched turtles as they rush along the shore towards the water. Once in the water, the babies become prey for voracious fish. At this time, a large number of lovers of their eggs and young usually accumulate near the breeding grounds of turtles. Depending on the species, the time required for the shell to harden varies, but is usually several months. After this, the turtles become relatively inaccessible to predators. In nature, turtles grow quickly. There is a known example when, even in captivity, Galapagos elephant tortoises (Geochelone elephantopus), starting from about 11 kg, annually gained the same amount until they weighed more than 100 kg. Many small species reach sexual maturity between the ages of 2 and 11 years.
Lifespan. No known vertebrate lives as long as turtles. Most of the information suggesting that their lifespan is slightly more than 50 years refers to individuals kept in captivity. Some species certainly live much longer. The Carolina box turtle (Terrapene carolina) found in Rhode Island was almost certainly 130 years old. The maximum period is considered to be approx. 150 years, but it is quite possible that the actual life expectancy of individual individuals is much longer.
Nutrition. Turtles in general can be called omnivores, although some species prefer plant food, others animal food, and still others eat everything. A strictly specialized diet is rare. Some aquatic turtles only feed underwater. Very young individuals require daily feeding, but this is not necessary for adults. In fact, once well fed, they can go months, and possibly years, without food. Turtles have no teeth, and the sharp edges of their jaws are capable of biting food, but not chewing it. Tough, fibrous plants are difficult for turtles to handle, and animal meat sometimes has to be torn into pieces using the claws on the front paws. Some species have horny ridges inside the mouth, which allow them to crush prey protected by hard coverings. Sense organs and higher nervous activity. Turtles are good at distinguishing odors at close range and, judging by some observations, use their sense of smell when choosing food. Vision is also well developed: these animals can be taught to recognize contours and colors. Both the shell and scaly skin have tactile sensitivity, and the giant tortoise even feels the pressure of a straw that is passed along its massive carapace. Although it has long been known that turtles are sensitive to vibrations transmitted through the soil, their ability to perceive air sound waves has long caused controversy. Today the existence of at least weak “ordinary” hearing in them is considered proven. Compared to other reptiles, turtles are very smart. They easily learn to follow their owner, seem to enjoy the attention they receive, and get used to a certain routine well. Apparently, some individuals are smarter than others. For example, among six Agassi gophers (Gopherus agassizi) living together, one individual at will climbed up inclined plane onto the platform and rolled down the other side along a metal chute. She obviously enjoyed this activity and repeated it for hours on end. But in some situations, turtles are surprisingly slow-witted. For example, they may spend a lot of energy climbing over an obstacle that is not difficult to get around; or for a long time they try to squeeze through a gap that is much smaller in size.
MAIN FAMILIES
More than 200 modern species of turtles have been described. These are only the remnants of a huge number of species that existed during the Age of Reptiles, which lasted approximately 120 million years and ended ca. 70 million years ago. The species that have survived to this day are grouped into 12 families. The most famous of them are described below.
Cheloniidae (sea turtles). Five or six species of the family are large reptiles with limbs resembling paddles or flippers. These are exclusively aquatic animals, coming ashore only to lay eggs or bask in the sun. It is very difficult for them to move on land. At least one species is found in all warm oceans.
Green (soup) turtle (Chelonia mydas)- the most famous of sea turtles. It is spread all over to the globe, and it is from it that the famous turtle soup is prepared. Previously, these reptiles were essentially mercilessly exterminated, often killing the females just before laying eggs.

Dermochelyidae (leatherback turtles). The leatherback turtle (Dermochelys coriacea) is the only living species of this family. This giant can reach a mass of more than 680 kg with a front flipper span of 3.6 m. The leathery shell bears 7 longitudinal ridges on the dorsal side and 5 on the ventral side. Although the range of these turtles covers all warm oceans, they are the rarest of the widespread species. marine species squad. The question of the systematic position of the group remains controversial. It was allocated to a special suborder Athecae (scutellae), but most experts agree only on the rank of superfamily.

Trionychidae (three-clawed). These turtles are easily recognized by their soft, leathery shell without any scutes. They have a flat body, an elongated conical snout and legs with webbed swimmers. These are one of the fastest turtles, moving quickly both in water and on land. The long neck allows it to grab food and bite the enemy painfully, even if they are at a considerable distance. The claws of large individuals can leave deep scratches. Representatives individual species They tolerate captivity well, living in it for up to 20 years or more (record - 25). Some three-clawed turtles are highly prized for their tasty meat. The largest of their 20 species, the large soft-shelled turtle (Pelochelys bibroni) lives in South-East Asia; its shell reaches a length of more than 1.2 m. Representatives of this family live in North America, Africa, Southeast Asia, the Malay Archipelago and New Guinea. Three species are found in the United States.

Pelomedusidae and Chelidae (suborder side-necked turtles: pelomedusids and snake-necked turtles). Representatives of these two families differ in the way the neck bends when retracting the head under the edge of the shell: in other turtles in the vertical plane, in them - in the horizontal plane, which explains special structure spine. Side-necks live in the Southern Hemisphere or the regions closest to it, not found in North America, Europe and Asia. Both families unite approx. 50 types. The most bizarre of all turtles is the matamata (Chelus fimbriata) from South America, a snake-necked turtle. Her head is covered with many outgrowths sticking out in different directions. The Australian snake-necked turtle (Chelodina longicollis) has a thin neck almost as long as its shell.

Chelydridae (snapping turtles). The family includes only 2 species, of which the best known is the snapping turtle (Chelydra serpentina). It is an aquatic reptile native to much of North America and northwestern South America, abundant in southeastern Canada and the eastern half of the United States, where it is highly prized as a food item. Cayman turtles are unfairly blamed for destruction large quantity fish and waterfowl. The weight of these animals often reaches 13.6 kg. When pulled out of the water, they can bite painfully. Another kind,
snapping turtle(Macrochelys temmincki) is one of the giants of the order, reaching a mass of approx. 90 kg. They are not only the heaviest among its freshwater representatives, but also the most attached to water among North American turtles. They are found in the southeastern United States, mainly in the lower Mississippi. Being slow, the snapping turtle lures prey with the help of a fleshy outgrowth of the bottom of the mouth, which moves in its open mouth like a worm.

Kinosternidae (mud turtles). 21 species of this family usually live on the bottom of rivers and lakes. The group's range extends from southeastern Canada through the center and eastern part USA to South America. The eight species of mud turtles found in the United States have small, fleshy “whiskers” on their chins that help distinguish them from other members of the order. The most famous member of the family, the common musk turtle (Sternotherus odoratus), lives in the waters of the eastern United States. Its length does not exceed 13 cm, but it greatly annoys local fishermen, as it often gets hooked, and when it is picked up, it secretes a stinking secretion from the musk glands. In addition, she is warlike and bites painfully.
Trailing turtles(genus Kinosternon) are found almost exclusively in the southeastern United States. They avoid deep bodies of water and come to land from time to time. The range of the Pennsylvania turtle (Kinosternon subrubrum) extends from the southeast of the country along the Atlantic coast to the southwestern tip of Connecticut.

Testudinidae (land turtles). This family includes approx. 40 species of turtles found on every continent except Australia. This includes the giant elephant tortoises (Geochelone elephantopus) from the Galapagos Islands and some bizarre African species. Thus, in African kinix tortoises (genus Kinixys), the back part of the carapace is movably connected to the front; the elastic tortoise (Malacochersus tornieri) from Tanzania and Kenya has a soft, flattened shell made of thin bony plates and can hide in narrow rock crevices in a moment of danger. The only representatives of this family found in the United States belong to the genus Gopherus; they live in the southern part of the country. In the 19th century Galapagos elephant tortoises were taken on whaling ships as supplies of meat for sailors. The capture of millions of individuals has undermined the population so much that it is in danger of extinction.

Emydidae (freshwater turtles). Exactly this big family order, uniting more than a third of all its species. They are common to the northern continents, also found in northern South America and Africa and are very diverse in size and body shape.
Painted turtle(Chrysemys picta), which is distributed throughout the United States, is one of the most famous members of the family. It often reaches high numbers even in small ponds. Box turtles (Terrapene) are also a common genus, but are not found in the western United States. They are mostly land animals; the movable elements of the plastron enable them to tightly close all the openings of the shell, like flaps. Ornamented turtles (Pseudemys) inhabit the southeastern United States.

Collier's Encyclopedia. - Open Society. 2000 .

See what "TURTLES" is in other dictionaries:

Turtles Illustration from the book by E. Haeckel ... Wikipedia

- (Testudines, or Chelonia), a detachment of reptiles. Known since the Triassic, descended from cotylosaurs. Feature structure Ch. is a bone-horny or bone-leathery shell covering the entire body, consisting of a dorsal (carapace) and abdominal... ... Biological encyclopedic dictionary

A squad of reptiles. They have (except for the leatherback turtle) a bony shell that is fused with the vertebrae and ribs. 12 families, including freshwater turtles, land turtles, sea turtles, etc.; OK. 230 species. They live mainly in the steppes and... Big Encyclopedic Dictionary

Turtles appeared on our planet about 200 million years ago, and about 135 million years ago, that is, in Cretaceous period, on Earth, according to scientists, there were about 26 families of turtles (currently there are only 12 of them). Interestingly, turtles have remained virtually unchanged since then.

The closest relatives of modern turtles, Proganochelis, lived in Europe and Asia during the Late Triassic period (200 million years ago). It is worth noting that these animals, like turtles, had a tortoiseshell-type shell and beak. However, unlike modern turtles, Proganochelis did not have the ability to retract its head and limbs into its shell. However, they did not need this, since the head and legs of these reptiles were protected by hard scales.

Currently, there are 5 suborders of turtles, 3 of which are major: side-necked, cryptonecked and shieldless turtles. The other two suborders trace their origins to the cryptonecked turtles.

Some researchers classify the leatherback sea turtle as a special suborder of shieldless turtles, which differ from all other turtles not only in appearance, but also in their internal structure. Their shell, unlike that of other turtles, consists of a layer of small interconnected polygonal bony plates and is not fused to the spine and ribs.

In addition, the shell is leathery sea ​​turtle covered on top with skin with many small horny scutes. Moreover, with age, the skin becomes smooth and even. Many scientists believe that the ancestors of leatherback sea turtles were Archelon ischyros, animals that lived in the seas of South Dakota more than 65 million years ago. The fossilized remains of this giant (weighing about 3 tons, up to 4 m long) were found in the flatlands of the central states of the United States, where the waters of the Niobar Sea once stretched. It is worth noting that the evolution of turtles belonging to different suborders proceeded independently of each other, therefore in their structure and appearance there are very significant differences.

For example, side-necked and cryptonecked turtles appeared during the Middle Triassic, and the names of these reptiles indicate the ways in which they retract their heads under their shells. Side-necks fold their neck horizontally, bending it like an S and pressing it to the base of the limb, while hidden-necks fold it vertically.

Side-necked turtles have remained virtually unchanged for millions of years, as evidenced by the remains of inhabitants of the Cretaceous period found during excavations.

Currently, side-necked turtles are found only in the Southern Hemisphere of our planet: Africa, Australia, New Guinea, Madagascar and South America.

Hidden-necked turtles, or cryptodires, are the most common group of turtles. It is believed that during the Middle Triassic period these animals lived only in swampy areas, but over time they adapted to live both on land, including desert and forest-steppe areas, and in water. In addition, their survival was facilitated by the fact that they ate a variety of food - plant and animal.

About 150–200 million years ago, in the Jurassic period, a suborder of soft-bodied turtles emerged from the group of cryptonecked turtles. These animals adapted to life in water, and gradually their shell became less massive, thanks to which the animals acquired the ability to swim at a fairly high speed. Currently, softshell turtles are considered the fastest of all species. They are able to move with high speed not only in the aquatic environment, but also on land.

The ancestors of snapping turtles lived in the Eocene, that is, approximately 38–55 million years ago. Having examined the fossil remains of these animals, scientists came to the conclusion that the shell of ancient snapping turtles was quite soft, and therefore the reptiles could not defend themselves in the event of an attack by predators and, in order not to become their prey, preferred to attack first, showing aggressiveness unusual for turtles. By the way, modern snapping turtles behave in a similar way. That is why they are not kept in home terrariums.

The so-called horned turtle is considered one of the most unusual in the evolutionary chain of turtles, about which controversy has not ceased in scientific circles for a long time. The fact is that some scientists classify horned turtles as... dinosaurs, while most scientific experts classify these extinct animals as reptiles.

The appearance of the horned turtles was truly terrifying. The animals reached 5 m in length. These reptiles had a huge tail, the same length as the shell, with two rows of bone spikes, clearly used for protection from enemies. The turtle's skull was triangular in shape, with long, slightly blunted horns directed sideways and backwards, which the animal also used for protection. There are holes in the front and back of the shell into which the animal can remove its limbs and head in case of danger. In some species of turtles, movable parts of the shell can completely cover one or both openings if necessary.