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Amphibians: Different Types, Definition, Photos, and More

There are about 4,000 kinds of amphibians, including anurans, anurans, and anurans. Characteristics: 1. Need to spend its childhood in water. 2. It has a bone structure adapted to living on land, has limbs, moist skin, and many glands. 3. The body has no scales or body hair. 4. The tongue is bifurcated, inverted, and can extend outward. 5. Mating and fertilization occur in water. 6. Larvae breathe through gills, while adults breathe through skin, oral lining and lungs.


Amphibia is a type of vertebrate that can live both in water and on land, and is an important transitional group in the evolution from aquatic animals to terrestrial animals. Their life cycle usually includes two stages: aquatic larvae and terrestrial adults, so they are called "amphibians".

  • Scientific name: Amphibia

  • Main features:

    1. Moist skin: The skin is exposed and moist, which helps breathing.

    2. Amphibious: The larvae are mostly aquatic and breathe with gills; the adults are mostly terrestrial and breathe with lungs and skin.

    3. Oviparous: Most of them lay eggs in water, and the larvae develop in water.

    4. Poikilotherms: Body temperature changes with the environment.

    5. Inner ear and vocal organs: Amphibians can usually hear sounds, especially frogs can make sounds.

  • Ecological role:

    • Pest control: Prey on small invertebrates such as mosquitoes.

    • Important link in the food chain: Both predator and prey.

  • Evolutionary history:

    • Originated in the Devonian period about 350 million years ago, it is the earliest vertebrate adapted to terrestrial life.

    • Amphibians are the ancestors of reptiles and are also important links between aquatic and terrestrial environments.


Classification table of amphibians

Amphibians are mainly divided into three orders: Anura (frogs), Caudata (salamanders), and Apoda (caecilians).

Classification levelOrderFamilyGenusExamples
AnuraAnura (Anura)Ranidae (Ranidae)Rana (Rana)Frog, Rana


BufonidaeBufoAmerican toad, common toad


HylidaeHylaAmerican green tree frog, red-eyed tree frog


DendrobatidaePoison dart frog (Dendrobates)Blue poison dart frog, golden poison dart frog
CaudataCaudataSalamandridaeSalamandraFire salamander, eastern salamander


CryptobranchidaeAndriasChinese giant salamander (baby fish), Japanese giant salamander


PlethodontidaePlethodonRed-backed salamander
GymnophionaCaeciliidaeCaeciliaCaeciliacaecilian


water caeciliansFamily (Typhlonectidae)Genus (Typhlonectes)Water caecilians

Main characteristics and adaptations of amphibians

1. Body structure

  • Moist skin: The skin helps with water balance and gas exchange.

  • Differentiated limbs: Most amphibians have four limbs, which are suitable for swimming and jumping.

  • Evolution of the tail: Anura adults have no tail, Caudata adults retain their tail, and Apoda adults are worm-like.

2. Breathing method

  • Gill breathing: Larvae absorb oxygen through gills.

  • Lung and skin breathing: Adults mainly rely on lungs and skin for breathing.

3. Reproduction and development

  • Egg laying in water: eggs are mostly colloid and absorb water easily.

  • Metamorphosis: larvae undergo metamorphosis (such as tadpoles turning into frogs).

4. Environmental adaptation

Most amphibians live in humid environments, but a few species are adapted to dry areas or completely aquatic environments.


Evolutionary History of Amphibians

  1. Early Amphibians:

    • Amphibians originated in the Devonian period, and the earliest fossil records show that they evolved from lobe-finned fish.

    • With strong flippers and lungs, these early amphibians entered land life for the first time.

  2. Development and Diversification:

    • During the Carboniferous and Permian periods, amphibians rapidly diversified and occupied a variety of ecological niches.

    • The emergence of reptiles gradually replaced the dominance of amphibians.

  3. Modern amphibians:

    • Existing amphibians are descendants of ancient amphibian groups, including Anura, Caudata and Apoda.


Ecological Roles of Amphibians

  1. Pest Control:

    • Prey on insects and small invertebrates, controlling pest populations.

  2. Key Link in the Food Chain:

    • Provide food for birds, mammals and snakes.

  3. Ecological Health Indicators:

    • Highly sensitive to habitat changes and environmental pollution, it is an important indicator species of ecosystem health.

Amphibians are one of the oldest and most important vertebrates on Earth. Whether it is beautiful frogs, rare giant salamanders, or mysterious caecilians, they all show the diversity of life.

Urodela Anura Apoda
Onychodactylus zhangyaping

Onychodactylus zhangyaping

Onychodactylus zhangyapingi,

Urodela LC

Features:The fundamental difference between it and other Hylobatids is that it has black keratin claws on the tips of its fingers and toes, and it does not have the respiratory organ - lungs - that other Hylobatids have, which is rare among amphibians.

The Jilin clawed salamander (scientific name Onychodactylus zhangyapingi) is an animal of the genus Onychodactylus of the family Hynobiidae in the order Caudata. It has a slender body, smooth skin, and a black and yellow marble pattern on its back. It has an elongated head with a rounded snout, two...

Onychodactylus zhaoermii

Onychodactylus zhaoermii

Onychodactylus zhaoermii

Urodela LC

Features:The ridge groove from the back of the head to the base of the tail is more obvious, the skin on the back of the body is smooth, and there is a shallow longitudinal groove from the back corner of the eye to the neck fold;

Liaoning clawed salamander is endemic to China. It is found in densely vegetated mountainous areas at an altitude of about 600m. It often lives near the source of streams or springs with cool water and many stones. It comes out of hibernation in early April and lives on land, but not far from the wa...

Protohynobius puxiongensis

Protohynobius puxiongensis

Protohynobius puxiongensis

Urodela LC

Features:The head is flat, the eyes are large and protruding, the limbs are well developed, the forelimbs are thinner, and the hind limbs are thicker.

Puxiong Prosaurus is a tailed amphibian of the family Hynantheidae and genus Prosaurus. In 1965, scholars from the Chengdu Institute of Biology, Chinese Academy of Sciences, collected specimen No. 1 of Prosaurus in an abandoned cellar for storing potatoes beside a stream at an altitude of 2,900 mete...

Hynobius maoershanensis

Hynobius maoershanensis

Hynobius maoershanensis,Maoershan Hynobiid

Urodela LC

Features:The head is large and slightly flat, and its color varies when alive. When in water, the back is black or yellow-green. When out of water, the back of the body is yellow-green or light purple-brown with no spots.

The Maoershan Small Salamander lives in the swamps and surrounding areas of the mountainous areas with an altitude of 1978 to 2015 meters. The vegetation nearby is mainly southern hemlock and mountaintop dwarf forests. It likes to eat a lot of small invertebrate aquatic organisms, such as earthworms...

Hynobius guabangshanensis

Hynobius guabangshanensis

Hynobius guabangshanensis,South Henan Small Salamander, Qishan Little Elf, Qiyang Small Salamander, Giant Salamander

Urodela LC

Features:It is similar to the Anji Hypsilophis davidianus, but this species is smaller in size. Its back is black or dark brown when alive, and slightly yellow-green under sunlight.

The Guabangshan Small Salamander lives in Guabangshan in Qiyang, Hunan. The highest peak of the mountain is 788 meters above sea level. Below 400 meters above sea level is the rice field area, and a few rice fields can reach about 600 meters. The salamander mainly lives in small mountain ponds, swam...

Hynobius chinensis

Hynobius chinensis

Hynobius chinensis,Chinese Salamander

Urodela LC

Features:The head is relatively large, with the length of the head being greater than its width, and the back of the body and tail is almost uniformly black or brown-black.

The Chinese salamander (scientific name: Hynobius chinensis) is an animal of the Hynobiidae family and the genus Hynobius. It is an ancient species dating back 300 million years and developed in the same era as dinosaurs. In 1889, a foreigner named Günther first discovered it in Xuanchang, Hubei, a...

Hynobius amjiensis

Hynobius amjiensis

Hynobius amjiensis,anji hynobiid

Urodela LC

Features:The base of the tail is nearly round, gradually flattened backwards, the dorsal fin fold is low and obvious, and the tail tip is blunt. The skin on the back of the body is smooth, with a longitudinal skin groove from behind the eyes to the neck fold; there is a ridge groove in the center of the back.

Anji Hynobius amjiensis is an amphibian of the Hynobiidae family and Hynobius genus, and is endemic to China.Anji Hynobius amjiensis has very strict requirements for habitat and water. This species lives in the humus layer under the peat moss in the swamp and enters the puddle during the spawning se...

Boulenophrys baolongensis

Boulenophrys baolongensis

Boulenophrys baolongensis,Baolong Heterohorned Toad

Anura LC

Features:This species is similar to the pale-shouldered horned toad, but this species has no marginal membrane on the toes, no webs between the toes, no large dark brown spots on the back of the head and body, and larger dark spots on the chest and abdomen.

The dragon-horned toad hides under the rocks or in the grass by the stream during the day. At night, the male toads often make chirping sounds on the rocks by the stream. They stop chirping under the electric light and do not escape. The tadpoles live in the streams with cool water quality, and ofte...

Oreolalax liangbeiensis

Oreolalax liangbeiensis

Oreolalax liangbeiensis,Liangbei tooth-shaped toad

Anura LC

Features:The warts on the head are small and flat, and the back of the body is covered with warts of different sizes, with more and denser warts towards the back. The back of the body and tail muscles are green-gray with a few dark spots.

The appearance of Liangbei toothed toad is similar to that of Oreolalax major, but the hind limbs of Liangbei toothed toad are shorter, the tibia is less than half of the body length, and the left and right heels just meet; there are no spots on the ventral surface. The lip and tooth pattern of tadp...

Scutiger chintingensis

Scutiger chintingensis

Scutiger chintingensis,Golden-necked Toad

Anura LC

Features:There are webs between the toes, long and prominent warts on the back, and no eardrum. There are two pairs of black thorns on the chest and armpit of the male toad, and there are black thorns on the upper arm and the inside of the forearm. Tadpoles are small and flat.

The golden-crowned toothed toad is flat and narrow, with a head that is almost equal in length and width. It lives in the top streams and their vicinity at an altitude of 2500-3050 meters in the mountains.The adult toads live on land. The breeding season is from the end of May to June. During the da...

Scutiger jiulongensis

Scutiger jiulongensis

Scutiger jiulongensis,Kowloon Cat's Eye Toad

Anura LC

Features:The head is relatively flat, with the width greater than the length; the tip of the snout is round and slightly protrudes from the lower lip, the skin is loose and thick, and the warts on the back of the body are large and flat.

The dragon-toothed toad is an amphibious wild animal of the Anura order and the Ceratophoridae family. It lives in the spring streams of high mountains at an altitude of 3120-3750m or under stones or mud pits in the water ponds of swamps.The toad moves slowly and lays eggs on the bottom of the water...

Scutiger muliensis

Scutiger muliensis

Scutiger muliensis,Muli cat-eyed toad

Anura LC

Features:This species is similar to the spiny-chested toad, but the black spines on the thymus of the male toad of this species are thick and sparse, with 10-26 spines in 10 square millimeters; there are small warts around the anus, thighs and ventral surface.

Muli Toothed Toad is an amphibian of the genus Toothed Toad, with a brown body and a grayish-white belly. It is endemic to China and is distributed in Sichuan (Muli).During the day, adult toads are mostly in and around gentle mountain streams with rich vegetation, generally living in the stream or u...

Scutiger ningshanensis

Scutiger ningshanensis

Scutiger ningshanensis

Anura LC

Features:The appearance is similar to that of the golden-crowned toad, but this species has a nearly rectangular blue patch at the tip of the snout, and a nearly square dark spot between the two eyes on the head that extends to the occipital region.

Pingwu Toothed Toad is an amphibian of the genus Toothed Toad of the family Spadefoot Toad, and is endemic to China.Adult toads are mostly found in small mountain streams with dense vegetation and nearby forests. During the day, they often hide under rocks in the stream or in earth holes on the shor...

Scutiger pingwuensis

Scutiger pingwuensis

Scutiger pingwuensis

Anura LC

Features:The male toad has two pairs of thorns on its chest, and black thorns on the inner sides of its upper arms and forearms; it has no teeth in its upper jaw; its skin is very rough, and almost its entire body is covered with black warts.

Pingwu Toothed Toad is an amphibian of the genus Toothed Toad of the family Spadefoot Toad, and is endemic to China.Adult toads are mostly found in small mountain streams with dense vegetation and nearby forests. During the day, they often hide under rocks in the stream or in earth holes on the shor...

Vibrissaphora ailaonica

Vibrissaphora ailaonica

Vibrissaphora ailaonica,Hairy Beard

Anura LC

Features:The male has 10-24 irregularly arranged black horny spines on each side of the upper lip; when the hind limbs are extended forward, the tibiotarsal joint reaches the posterior corner of the eye.

The name of the Ailao Bearded Toad comes from Ailao Mountain, because it was first discovered in Ailao Mountain in Yunnan in the 1980s; however, it can also be found in the nearby Wuliang Mountain. In Wuliang Mountain, it is also called "Ang" because of its "Ang, Ang" sound.The A...

Leptobrachium boringii

Leptobrachium boringii

Leptobrachium boringii,Emei Moustache Toad,Vibrissaphora boringii,Horned Monster, Bearded Toad, Bearded Toad

Anura LC

Features:The male toad has 5-8 keratin spines on each side of the upper lip, while the female toad has the same number of beige dots on the corresponding parts.

The Emei Bearded Toad is an amphibian of the family Ceratopus and the genus Pseudocercidae. It lives near mountain streams with lush vegetation at an altitude of 700-1700 meters. Adult toads live on land in the grass on the hillside, are not good at jumping, and crawl slowly. Tadpoles mostly move be...

Leptobrachium leishanensis

Leptobrachium leishanensis

Leptobrachium leishanensis,Pupa, Horned Monster

Anura LC

Features:The male toad has two keratin spines on each side of the upper lip, located behind and below the eyes; there is no vocal sac.

The Leishan mustache is an amphibian of the family Ceratopsidae and the genus Pseudomonas. The body is stout. The head is flat and the width of the head is greater than the length of the head. The skin is smooth, loose and wrinkled, and there is a network of skin ridges composed of moles on the back...

Leptobrachium promustache

Leptobrachium promustache

Leptobrachium promustache,Chinese horned monster, bearded frog, Chong'an bearded toad, pit goose, thunder horned monster

Anura LC

Features:The body is small, with about 165-194 irregularly arranged black horny spines on the edge of the upper lip; the male has a single hypopharyngeal vocal sac.

The original bearded toad is an amphibian in southern China. It is a species endemic to China. Compared with other toads, the tadpole period of the bearded toad is long, it is easily eaten by natural enemies, and the survival rate is low, so the original bearded toad is a rare animal in the world. D...

Boulenophrys insularis

Boulenophrys insularis

Boulenophrys insularis,Heterohorned toad,Xenophrys insularis

Anura LC

Features:The body is stout, with a head that is slightly wider than its length; the hind legs are short, with an incomplete triangular spot between the eyes, and dark brown horizontal stripes on the back of the limbs.

The South Australian Island Horned Toad inhabits mountainous streams in humid subtropical evergreen broad-leaved forests at an altitude of 50-500 meters. It is commonly found on the forest floor, litter layer or nearby bushes.The skin on the back of the toad is rough, scattered with small particles...

Xenophrys shuichengensis

Xenophrys shuichengensis

Xenophrys shuichengensis,Water City Heterohorned Toad

Anura LC

Features:The appearance of this species is similar to that of the spiny-fingered horned toad, but the Shuicheng horned toad is larger in size, and the female toad has a very obvious triangular protrusion on the outer side of the upper eyelid; the male toad has no nuptial spines on its fingers and no vocal sac.

This toad lives in the subtropical evergreen broad-leaved forest mountainous area at an altitude of 1800-1870m. Its living environment is a gentle stream with cool water, dense bushes and weeds on both sides, and many limestone stones in the stream.From April to July, adult toads move near the sourc...

Bufo stejnegeri

Bufo stejnegeri

Bufo stejnegeri,Toad, Glandular Toad,Stejnegeds toad

Anura LC

Features:Small body; no eardrum; the parotid gland is short and slightly round, with a length-to-width ratio of approximately 5:4.

Shi's toad is an amphibian of the genus Toad of the family Toad, commonly known as the toad. In mainland China, it is distributed in Liaoning and other places. It generally lives in weeds and bushes near mountain rivers and likes to live under rocks. Its living altitude range is 200 to 700 meter...