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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
Sacalia quadriocellata

Sacalia quadriocellata

Sacalia quadriocellata,Four-eyed Turtle,Six-eyed turtle, four-eyed turtle, four-eyed spotted turtle

Features:The head and neck are brown-olive in color, with two pairs of eye spots closely arranged on the back of the head.

Four-eyed turtle is called Four-eyed Turtle in foreign language, and has no subspecies.In nature, four-eyed turtles like to live in pits and ditches in mountainous and hilly areas, and often live in dark places, such as under stones and in tree roots. The four-eyed spotted turtle is very timid. Once...

Cuora zhoui

Cuora zhoui

Cuora zhoui,Zhou`s Box Turtle,Black box turtle, black turtle

Features:Carapace is black or earthy black, with a tiny notch between the left and right hip shields

Zhou's Box Turtle is called Zhou's Box Turtle in foreign language, and has no subspecies.Zhou's Box Turtle is named after Zhou Jiufa, the director of Nanjing Wulongtan Park, who discovered this turtle species in February 1990.The living habits of wild Zhou's box turtles have not been...

Cuora yunnanensis

Cuora yunnanensis

Cuora yunnanensis,Yunnan box turtle,turtle

Features:The carapace is slightly flat, the rear edge of the plastron has a clear notch, and there are no three black vertical lines on the back

Yunnan box turtle is called Yunnan box turtle in foreign language, and has no subspecies.Yunnan box turtle was originally named after the specimen collected by foreign missionary Boulenger in Yunnan in 1906.The Yunnan box turtle lives in the plateau mountains at an altitude of 2000-2260 meters, and...

Cuora picturata

Cuora picturata

Cuora picturata,Southern Vietnam Box Turtle,Annam's box turtle

Features:Cream or yellow head, cream belly, with a large black spot on each scale

The foreign name of the patterned box turtle is Southern Vietnam Box Turtle, and there is no subspecies.The patterned box turtle was previously published as the yellow-fronted box turtle pictorial subspecies (Cuora galbinifrons picturata), and in 2004 Stuart and Parram (Stuart & Parham promoted...

Cuora pani

Cuora pani

Cuora pani,Pan's box turtle,Pan's box turtle

Features:At around 15℃, they stop eating or eat less, and below 10℃, they enter hibernation

Pan's box turtle is called Pan's box turtle in foreign language, and has no subspecies.Pan's box turtle is the northernmost species of the genus Pan's box turtle in China. It was first discovered in 1981 in a ditch beside a rice field at an altitude of 420 meters in Xujiaba, Pingli C...

Cuora mouhotii

Cuora mouhotii

Cuora mouhotii,Keeled Box Turtle,Saw-edged box turtle, octagonal turtle, octagonal turtle, square turtle, saw-edged box turtle

Features:It likes warmth and is afraid of cold. The front and rear edges of the carapace have serrated shields.

Keeled Box Turtle has two subspecies.Keeled Box Turtle feeds on animals, but also plants, especially live food, such as locusts, mealworms, earthworms, etc. It likes warmth and is afraid of cold. It hibernates when the ambient temperature is 19℃, eats normally at 25℃, and eats the most at 28-31℃....

Cuora mccordi

Cuora mccordi

Cuora mccordi,Bose box terrapin,Mccord's Box Turtle,MacArthur's box turtle

Features:It is named after its origin near Baise City in Guangxi.

Bose box turtle is called Bose box terrapin in English, and has no subspecies.The Baise Box Turtle was named by C.H Emst in August 1988 based on the specimens purchased from the west of Baise City, Guangxi, China, near the border of Yunnan. Because its origin is near Baise City, Guangxi, the Chinese...

Cuora galbinifrons

Cuora galbinifrons

Cuora galbinifrons,Indochinese Box Turtle,Hainan box turtle, yellow-fronted box turtle

Features:The dry season has a hibernation period of nearly 4 months

The foreign name of the yellow-fronted box turtle is Indochinese Box Turtle, and there is no subspecies.The yellow-fronted box turtle likes to live in streams and shallow water areas in hilly and mountainous areas, and often hides in fallen leaves under the forest. It is diurnal and often lives by s...

Cuora flavomarginata

Cuora flavomarginata

Cuora flavomarginata,Yellow-margined Box Turtle, splint turtle, snake-killing turtle, broken plate turtle, yellow-margined box turtle

Features:Likes to live in groups and is not afraid of people

Yellow-margined Box Turtle has two subspecies.Yellow-margined Box Turtle is bolder than other freshwater turtles and is not afraid of people. Except for the mating season, it rarely fights with its own kind. After one month of domestication, individuals can develop the habit of eating at regular tim...

Cuora trifasciata

Cuora trifasciata

Cuora trifasciata,Chinese Three-striped Box Turtle,Golden coin turtle, golden head turtle, red edge turtle, red belly turtle, broken board turtle, Sichuan back turtle

Features:It is an edible turtle species in southern China and is also commonly used as medicine by the people.

The three-striped box turtle is called Chinese Three-striped Box Turtle in English, and there are 2 subspecies.The two subspecies of the three-striped box turtle have similar diets and other biological characteristics. The Vietnamese subspecies is more adaptable and grows faster than the Hainan subs...

Cuora bourreti

Cuora bourreti

Cuora bourreti,Bourett's Box Turtle,Brandt's box turtle,Bourett's Box Turtle,Cuora galbinifrons bourreti Obst & Reimann

Features:The head color is brighter, the body is larger than the patterned closed-shell turtle, and is elongated and oval.

Bourett's Box Turtle is a medium-sized land turtle.The Bourreti box turtle was previously published as Cuora galbinifrons bourreti, and was first described by Stuart and Parram in 2004. Parham promoted it to an independent species; in 2006, Fritz et al. questioned its independent species status;...

Golden-headed Box Turtle

Golden-headed Box Turtle

Golden-headed Box Turtle,Golden turtle, splint turtle, yellow turtle

Features:The head is golden yellow, with slightly yellowish brown on the sides and three thin black stripes

Golden-headed Box Turtle, with two subspecies.In the late 1980s, Luo Bitao and Zong Yu, based on the No. 3 model specimen obtained from Nanling, believed that the turtle belonged to a new species of box turtles and named it the golden-headed box turtle based on the morphological taxonomy of turtles....

Cuora amboinensis

Cuora amboinensis

Southeast Asian Box Turtle,Southeast Asian Box Turtle,Humpback turtle, Vietnamese turtle, Ambu box turtle

Features:They like to live in water and do not fight for food or bite each other.

The Southeast Asian Box Turtle has four subspecies.In his book The Reptiles of China, Pope (1935) mentioned two specimens of the Malayan Box Turtle from China, which were preserved in a Paris museum, but their origin was unknown. Cen Jianqiang and Tang Jun (1992) reported that they bought four Malay...

Scatophagus argus

Scatophagus argus

Scatophagus argusThree-lined box turtle, red-sided turtle, red-bellied turtle, broken plate turtle, golden-headed turtle

Features:It has a golden appearance, a red base, and a docile personality, making it suitable as a pet.

The scientific name of the golden coin turtle is the three-lined box turtle (Cuora trifasciata), which belongs to the order Testudinata, family Testudinidae, subfamily Testudininae, genus Testudinata, and is a second-class protected animal in my country. The golden coin turtle is a precious animal r...

Alligator sinensis

Alligator sinensis

Alligator sinensis ,Chinese Alligator,Alligator, Chinese alligator, earth dragon, pig dragon

Features:It is endemic to China, has a flat head, short and thick limbs, a long and laterally flattened tail, scales with more granular and banded patterns, and earth-colored eyes.

The Yangtze alligator, Alligator sinensis (Fauvel, 1879), was called tuó in ancient times, and is commonly known as "earth dragon" or "pig dragon" in the folk. It is a small crocodile unique to China and is listed as a national first-class key protected wild animal. The Yangtze...

Rafetus swinhoei

Rafetus swinhoei

Rafetus swinhoei,Yangtze Giant Softshell Turtle;Swinhoe's softshell,Rùa Hồ Gươm,Taihu turtle, giant softshell turtle, spotted softshell turtle, and Stuart softshell turtle

Features:The head, neck and back of the limbs are also dark green with irregular yellow spots of different sizes. This dense yellow pattern is a characteristic of the Yangtze giant softshell turtle.

In ancient times, the Yangtze giant softshell turtle was widely distributed in the lower reaches of the Yangtze River and the Taihu Lake area in China. The ancients called it the 癞头缋. Due to wanton hunting and ecological damage, no wild individuals have been found since 1972. There are only two c...

Palea steindachneri

Palea steindachneri

Palea steindachneri,wattle-necked softshell turtle,Trionyx steindachneri Siebenrock,Mountain Rui, Rui fish, soft-shelled turtle, round fish, turtle, tortoise

Features:Its appearance is very similar to that of the Chinese soft-shelled turtle, commonly known as "turtle". It is round in shape, but slightly larger and thicker.

The mountain softshell turtle is a cold-blooded animal. When the temperature drops to 12℃, it will hibernate under the sand or stones, so people also call it the sand softshell turtle. When the temperature rises to 18-20℃ in the next spring, it will wake up and start looking for food. The optimum...

Pelochelys cantorii

Pelochelys cantorii

Pelochelys cantorii,Frog-faced Softshell Turtle、Asian Giant Soft-shelled Turtle、Cantor's Giant Softshell,Blue grouper, silver fish, green grouper, giant turtle, spotted turtle, Cantor's gian

Features:The largest species of turtle, it has a relatively small head and small eyes. It likes to live in groups and has a long lifespan.

Before and after the release of the "List of National Key Protected Wildlife in China" in 1989, according to the "Fauna Sinica", all giant freshwater turtles in China were called "turtles". Therefore, the turtle (then scientific name Pelochelys bibroni), which was liste...

Dermochelys coriacea

Dermochelys coriacea

Dermochelys coriacea,Leatherback Turtle,Leatherback turtle, seven-winged turtle, sampan turtle, swallow turtle, leatherback turtle

Features:The largest of the order Testudinata, its body and limbs are covered with irregular polygonal scales. The largest is found in

The leatherback turtle is large and is the largest turtle in the world. It has a large head, short neck and tail, paddle-shaped limbs, no claws, and particularly developed forelimbs.The leatherback turtle is a cold-blooded reptile that swims fast and has strong ability. It is omnivorous and lays egg...

Lepidochelys olivacea

Lepidochelys olivacea

Lepidochelys olivacea,Olive Ridley, Pacific Ridley,Ridley du Pacifique, Tortue Bâtarde, Tortue Olivâtre, Tartaruga-comum, Tartaruga-oliva, Tartaruga-pequena,Tortue de Ridley,Tortuga Carpintera, Tortug

Features:The limbs are flat like paddles. The head, limbs and back of the body are dark olive green, and the plastron is light orange-yellow.

The Olive Ridley is marine and little is known about its behavior other than its regular annual trips to nesting beaches. It feeds in the morning and basks on the surface in the afternoon. Large groups of turtles gather together to bask in the afternoon to escape the freezing temperatures of the wat...

Eretmochelys imbricata

Eretmochelys imbricata

Eretmochelys imbricata, Hawksbill Turtle,Caret, Tortue Caret, Tortue imbriquée, Tortue à bec faucon, Tortue à écailles,Tortuga de Carey,سلحفاة صقرية المنقار

Features:It likes heat and fears cold, and can live up to 1,500 years, making it one of the longest-lived animals.

Hawksbill turtles are an animal that often migrates. They are highly mobile and swim fast. They are large and fierce carnivorous animals in the ocean and often appear in coral reefs. Hawksbill turtles have strong adaptability and resistance to their prey. Some of the sponges they feed on are highly...