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Reptiles: Different Types, Definition, Photos, and More

Reptiles (Reptilia) are a large group of vertebrates that mainly cover their bodies with dry scales or shields and are mainly adapted to terrestrial environments, but some also live in water. They have an important position in the history of evolution and are the first vertebrates to fully adapt to terrestrial life.

  • Scientific name: Reptilia

  • Main features:

    1. Body covered with scales: Epidermal scales or shields prevent water loss

    2. Oviparous: Most reptiles reproduce by laying eggs, which have tough shells.

    3. Poikilotherms: Body temperature changes with ambient temperature.

    4. Pulmonary respiration: Reptiles rely on lungs for respiration.

    5. Diverse limb structures: Some reptiles (such as snakes) have degenerated and have no limbs.

  • Ecological role:

    • Predator: Control the number of pests and small animals.

    • Food source: Provide energy for birds of prey, mammals, etc.

  • Evolutionary history:

    • Originated in the Carboniferous period about 310 million years ago.

    • It is an animal that evolved from amphibians and is fully adapted to terrestrial life.

    • Reptiles are the ancestors of dinosaurs and birds.


Classification of reptiles

Reptiles are traditionally divided into four major orders: Lepidosauria (snakes and lizards), Testudinata (turtles), Crocodilia (crocodiles), and Rhynchocephalus (representatives of ancient reptiles).

Classification levelOrderFamilyGenusExamples
LepidosaursSquamataLacertidaeLacertaGreen lizard, sand lizard


VaranidaeVaranusKomodo dragon


ViperidaeViperaCommon viper


ElapidaeNajaCobra, Black Mamba


BoaPython


CrotalinaeCrotalusRattlesnake
TestudinataTestudinata (Testudines)TestudinidaeTestudoSulcata tortoise, Indian star tortoise


CheloniidaeCheloniaGreen turtle, hawksbill turtle


Mud turtle family (Kinosternidae)Mud turtle genus (Kinosternon)Mud turtle


TrionychidaePelodiscusChinese softshell turtle
CrocodyliaCrocodile (Crocodylidae)Crocodile (Crocodylus)Nile crocodile, saltwater crocodileNile crocodile, saltwater crocodile


AlligatoridaeAlligator (Alligator)American alligator, Chinese alligator


GavialidaeGavialisGharials
RhynchocephaliaRhynchocephaliaSphenodontidaeSphenodonSphenodon (endemic to Oceania)

Main characteristics and adaptations of reptiles

1. Body structure

  • Scales and shields: Prevent water evaporation and adapt to dry environments.

  • Evolution of limbs: Most have limbs, while snakes have degenerated into limbless ones.

  • Skeletal system: Reptiles have strong bones, which are particularly suitable for life on land.

2. Respiratory system

  • Pulmonary breathing: Reptiles rely entirely on lungs for gas exchange, which is more efficient than amphibians.

3. Reproduction

  • Oviparous: Most reptiles lay eggs with tough shells.

  • A few are viviparous: Some snakes, for example, can give birth to their young directly.

4. Poikilothermia

The body temperature of reptiles changes with the external environment, so they live in warm areas.



History of Reptile Evolution

  1. Early Reptiles:

    • Reptiles originated in the Carboniferous period, and the earliest reptiles were called "Anaplasti".

    • They evolved from amphibians and developed more efficient waterproof skin and respiratory systems.

  2. Age of Dinosaurs:

    • Reptiles reached their peak in the Mesozoic Era (about 200 million years ago), including dinosaurs, pterosaurs, etc.

    • Dinosaurs were the most successful group of reptiles, and their descendants evolved into modern birds.

  3. Modern Reptiles:

    • Existing reptiles are survivors of the extinction of dinosaurs, including crocodiles, snakes, lizards, and turtles.


Ecological Roles of Reptiles

  1. Predators and Food Chain Control:

    • Large reptiles such as crocodiles are top predators.

    • Lizards and snakes control the number of pests and maintain ecological balance.

  2. Seed Dispersers:

    • Some lizards eat fruits and spread seeds, which helps vegetation reproduce.

  3. Environmental Health Indicators:

    • Reptiles are very sensitive to habitat changes, and their numbers can reflect the health of the ecological environment.


Reptiles in the World

1. Lepidosauria (Snakes and Lizards)

  • Includes the largest variety of reptiles, such as pythons, rattlesnakes, geckos and monitor lizards.

  • Widely distributed throughout the world, from tropical rainforests to deserts.

2. Testudinata (Turtles)

  • Turtles are widely distributed in terrestrial and aquatic environments, including sea turtles, land tortoises and freshwater turtles.

  • Representative species: green turtles, sulcata tortoises.

3. Crocodiles (Crocodile)

  • Includes large aquatic reptiles such as the NidaliaCrocodiles and American alligators.

  • Crocodiles live in tropical wetlands and rivers.

4. Rhynchocephalus

  • There is only one species left: the Rhynchocephalus, which is distributed in New Zealand.

  • Known as a "living fossil", it is a species left over from the dinosaur era.


Reptile conservation status

  1. Habitat destruction:

    • Deforestation and wetland destruction seriously threaten the survival of reptiles.

  2. Climate change:

    • Affects the incubation temperature and sex ratio of eggs.

  3. Illegal trade:

    • Turtles and snakes are often illegally caught due to their high economic value.

  4. Protection measures:

    • Establish nature reserves.

    • Strengthen international cooperation to protect endangered species.


Conclusion

Reptiles are among the oldest and most adaptable animals on Earth, and their diversity tells a remarkable story of evolution. From rattlesnakes in the desert to turtles in the deep sea, reptiles have adapted to a variety of extreme environments.

Testudines Squamata Crocodilia Lizardia
Chelonia mydas

Chelonia mydas

Chelonia mydas,Green Turtle,Sea turtle, black turtle, stone turtle

Features:One of the largest hard-shelled sea turtles, it is named for the green color of its fat.

The green turtle, also known as the sea turtle, is one of the larger species of sea turtles. It is named because its body fat is rich in chlorophyll, the main food of seaweed. The gender of adult turtles is easy to identify, and the length of the tail is a gender characteristic. Generally speaking,...

Caretta

Caretta

Caretta,Loggerhead turtle, loggerhead sea turtle, loggerhead sea turtle, loggerhead sea turtle, loggerhead sea turtle, loggerhead sea turtle

Features:The back of the head is brownish red, the sides of the head are light brown, the belly and jaws are yellow. The back of the neck is dark. The eyes are large, the carapace is brownish red, and the backs of the limbs are also brownish red.

The loggerhead sea turtle is a single species worldwide that spends most of its life in the open ocean and shallow waters. It rarely comes ashore, except for brief nesting and egg-laying by females. Hatchlings live in floating clumps of Sargassum. Adults and juveniles live on the continental shelf a...

Sacalia bealei

Sacalia bealei

Sacalia bealei,Beal's eyed turtle,Spotted turtle

Features:There is usually a pair of eye-shaped spots on the back of the head, with 1-3 black spots in the center.

The spotted turtle is aquatic, mainly living in streams with slow and clear water flow and gravel bottom in hilly areas below 400 meters above sea level. It is timid and will retract its head, tail and limbs into its shell or run around aimlessly when disturbed. It likes to bask in the sun, and the...

Geoemyda spengleri

Geoemyda spengleri

Geoemyda spengleri,Black-breatsed Leaf Turtle,Golden turtle, twelve-horned turtle, maple leaf turtle, black-breasted leaf turtle, twelve-winged turtle

Features:They eat small amounts and grow slowly.

The ground tortoise lives in the shaded and moist areas near streams in the mountain jungle at an altitude of about 700 meters, and is also often found in streams. It is terrestrial or semi-aquatic and cannot enter deep waters. The understory trees, vines and bamboos in its habitat are abundant, and...

Cuora

Cuora

Cuora,Broken plate turtle, snake turtle, snake-claw turtle, Asian box turtle

Features:The plastron can be completely closed to the carapace

The genus Cuora (scientific name: Cuora) is a genus of Testudinata, Testudinidae, commonly known as box turtles. They are distributed in the Yangtze River and all places south of it in my country. Common ones include golden-headed box turtles, yellow-margined box turtles, three-lined box turtles, Yu...

Mauremys mutica

Mauremys mutica

Mauremys mutica,Stone turtle, stone golden coin turtle, water turtle, yellow turtle, fragrant turtle

Features:The individual is medium-sized, flat and oval in shape, with a small head. The back of the head is smooth and scaleless, yellow or yellow-olive in color, and the ventral side of the head and throat are yellow, hence the name.

The yellow-throated water turtle lives in the waters of hilly areas, mountain basins in semi-mountainous areas, and river valleys. Sometimes it also often moves in bushes and rice fields. During the day, it mostly plays and forages in the water. On sunny days, it likes to be on land, and sometimes c...

Mauremys sinensis

Mauremys sinensis

Mauremys sinensis,Chinese Stripe-necked Turtle,Ocadia sinensis Gray,1834,Chinese turtle, spotted turtle, pearl turtle, long-tailed turtle, Taiwan turtle

Features:The head is small, with a tapered snout that protrudes beyond the tip of the beak.

The flower turtle is an aquatic turtle. It is water-loving and has the habit of going ashore to bask in the sun. When the temperature is above 25℃ and the weather is fine and sunny, the flower turtle likes to climb onto the terrace or the shore to bask in the sun. The flower turtle has a wide adapt...

Mauremys nigricans

Mauremys nigricans

Mauremys nigricans,Red-necked pond turtle,Painted turtle, black-necked painted turtle, three-lined turtle, Guangdong grass turtle, black-necked terrapin

Features:They like warmth and are afraid of cold. They have a gentle temperament and will not hurt others on their own initiative.

The black-necked turtle is large in size and lives in streams in subtropical hilly and mountainous forests. The black-necked turtle moves clumsily, crawls slowly, has a gentle temperament, and does not actively hurt people. The black-necked turtle likes warmth and is afraid of cold. It cannot live i...

Cyclemys oldhamii

Cyclemys oldhamii

Cyclemys oldhamii,Snake-catching turtle, snake-catch turtle, snake-killing turtle

Features:Darker body color

The European turtle is a wild animal of the order Testudinata and family Geochelone. In the wild, it often hides near dead trees to look for insects. The juveniles are closer to water turtles, but cannot go into deep water....

Testudo horsfieldii

Testudo horsfieldii

Testudo horsfieldii,Afghan Tortoise Central Asian Tortoise Four-toed Tortoise Horsfield's Tortoise Steppe Tortoise,Land turtle, taspaha, prairie tortoise, land tortoise, turtle

Features:The four-clawed tortoise is the only tortoise that lives in the desert grasslands of my country.

In the Yili River Valley in Xinjiang, China, there is a small creature called "Tasipaka". "Tasipaka" means "stone" and "Paka" means "toad". What kind of animal is this stone-like toad? It is the four-clawed tortoise, which is listed as "critical...

Manouria impressa

Manouria impressa

Manouria impressa,Impressed Tortoise, Kirin tortoise

Features:As the name suggests, the carapace is flat and even concave in the middle, forming a groove with three horizontal lines.

Concave-shelled tortoise lives in tropical and subtropical mountainous areas. Adults live on the banks of mountain streams, and young turtles can climb up to the banks and lie horizontally on tree trunks to bask in the sun. They live far away from water and have a narrow distribution area. They feed...

Indotestudo elongata

Indotestudo elongata

Indotestudo elongata,Elongated Tortoise,Yellow elephant turtle, pillow turtle, dry turtle, Burma land, dragon claw turtle and so on

Features:Big eyes, short neck, high back and long nails.

Burmese tortoises are subtropical terrestrial tortoises, living in mountains, hills and bush forests, active at night, warm and afraid of cold. Docile, spiritual, mainly herbivorous, but also eat animal food, can feed melons, fruits, vegetables, lean meat, etc., like to eat tomatoes. The optimum te...

Platysternon megacephalum

Platysternon megacephalum

Platysternon megacephalum,Big-headed Turtle,Hawk-billed turtle, big-headed flat-chested turtle, eagle turtle, etc

Features:The body is flat, the head is large, and it cannot be shrunk into the shell.

Flat chest turtle like Yin fear of high temperature, fierce temperament, rock climbing and tree climbing ability is very strong. It lives mainly in the clear streams of the mountains. It also appears in swamps, pools, rivers and fields, generally at night, can climb stone walls or trees, and can cli...

Testudines

Testudines

Tortoise, golden turtle, grass turtle, mud turtle, mountain turtle, black turtle, flower turtle

Features:Turtles have a long lifespan and their shells can be boiled into turtle glue, which is a commonly used Chinese medicine.

In a broad sense, turtle refers to the general term for animals of the order Testudinata, and in a narrow sense, refers to species under the family Testudinidae. It is an ancient reptile that still exists. Generally, turtles are also called tortoises. Turtles are reptiles that evolved with shells as...

Cobra

Cobra

Ophiophagus hannah,King Cobra

Features:The world's largest front-fanged venomous snake, one of the most dangerous snakes in the world, and the longest of all venomous snakes.

King cobra is different from real cobra. It is not a member of the genus Cobra, but belongs to the independent genus Cobra. Compared with other cobras, it is more ferocious, extremely quick to react, flexible in turning its head and neck, and has a large amount of venom. It is one of the most danger...

Aldabrachelys gigantea

Aldabrachelys gigantea

Aldabra giant tortoise, Seychelles giant tortoise, Darding giant tortoise, Arnold's giant tortoise

Features:The second largest tortoise in the world.

This tortoise was discovered by humans more than 400 years ago. At that time, people did not realize that it was a long-lived animal. It was not until the most famous Aldabra tortoise, Advita, appeared that people began to study the age of tortoises. The Sanskrit meaning o...

Centrochelys sulcata

Centrochelys sulcata

Sulcata tortoise, Sulcata tortoise, African spurred tortoise, spurred tortoise, hairy-clawed tortoise

Features:The third largest tortoise in the world and the largest tortoise on the African continent.

The Sulcata tortoise is a tortoise reptile that lives on land. It originally belonged to the family Testudinidae and the genus Testudinidae, so its Chinese name includes the Sulcata tortoise and the Sulcata tortoise. It was finally classified into the genus Centrochelys and is the only surviving spe...

Chelonia mydas

Chelonia mydas

green sea turtle,Green turtle, blue turtle, stone turtle, tsio̍h-ku,ku-piah,ku-phi̍ah

Features:One of the largest hard-shelled sea turtles.

Turtles are one of the oldest animals on Earth. These creatures have existed in the world for more than 200 million years, but their living environment is being threatened by the growing development of humans. Therefore, in 2000, the American Turtle Rescue Organization launched an international fest...

Chlamydosaurus kingii

Chlamydosaurus kingii

Frilled lizard, cloaked lizard, frilled lizard, Australian cloaked lizard, pleated lizard, wrinkled lizard

Features:When meeting an enemy, hold up an umbrella to intimidate them. If they fail to scare them, stand upright and run away.

伞蜥来自新几内亚南部和澳大利亚北部沿海地区,是一种知名度极高的中大型蜥蜴,在鬣蜥科属于第二大蜥蜴(最大的是斑帆蜥)。两种不同产地的伞蜥,体型颜色上会有明显区别,原产于澳洲的伞蜥体型更大,颜色偏棕红。而产于印尼的伞蜥体型稍小,颜色偏灰白。市面上常见的是来自印尼个体。大部分时间在树上,也会到地面上捕食。...

Varanus salvator

Varanus salvator

Water monitor, marsh monitor, five-clawed golden dragon, four-legged snake, round-nosed monitor

Features:The second largest lizard in the world.

Speaking of the nickname of the water monitor lizard, everyone is familiar with it, that is - the five-clawed golden dragon.Although the water monitor lizard looks unfriendly, it is actually very docile and very friendly to people. It is said to be a non-aggressive animal, and no cases of biting peo...

Chamaeleo calyptratus

Chamaeleo calyptratus

Veiled chameleon

Features:The easiest chameleon species to breed.

The veiled chameleon is native to Central Asia, such as Saudi Arabia and Yemen, so they have another name - Yemen chameleon. They are a relatively large chameleon and are also the most suitable chameleon for beginners to raise.When the mood is beautiful, the iridophore crystals are closely arranged,...