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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
Hynobius sonani

Hynobius sonani

Hynobius sonani,Chunan's Salamander

Urodela LC

Features:The base color of the back is light brown, yellowish brown or pinkish brown, with irregular dark brown spots scattered on it, and dense spots in the middle of the body.

Chunan Hynobius is a tailed amphibian belonging to the Hynobiidae family and the genus Hynobius. It lives in high and cold mountainous areas at an altitude of 2750 to 3500 meters. It often lives under stones in dense forests and overgrown weeds or under stones beside mountain streams. Its habitat is...

Hynobius leechii

Hynobius leechii

Hynobius leechii,Northeastern China Salamander,Water snake, baby salamander, water snake, mullet

Urodela LC

Features:The head is flat and oval, the tail is flattened laterally, the eyes are large but not very protruding, and the back of the body is dark gray or gray-brown.

The Northeast Hypsilophis davidianus lives on land during the non-breeding season, hiding during the day and coming out at night, and also going out on rainy days. It often moves and forages in the dead branches and leaves, under rocks, fallen trees or in the grass on the hillsides on both sides of...

Hynobius nanhuensis

Hynobius nanhuensis

Hynobius nanhuensis

Urodela LC

Features:The back is light yellowish brown with irregular but evenly distributed short black-brown stripes.

Nanhu Hypsilophis lives in high-altitude mountainous areas with harsh environments. The population is very small and it is endemic to China.It is listed in the second level of the "List of National Key Protected Wildlife in China"....

Hynobius fucusLai and Lue, 2008

Hynobius fucusLai and Lue, 2008

Hynobius fucusLai and Lue, 2008

Urodela LC

Features:The sides and belly are brown with light yellow spots.

The Guanwu Small Salamander lives in mountainous areas at an altitude of 1200-2100m, where the vegetation is a mixed forest of mangroves and conifers. Adult salamanders live under dark and damp stones or rotten leaves. Their population is rare and difficult to find. The breeding season is mainly in...

Hynobius formosanus

Hynobius formosanus

Hynobius formosanus,,Formosan Hynobiid、Taiwan SalamanderTaiwan Salamander

Urodela LC

Features:The back of the body is brown or dark brown, with no patterns or with golden spots.

Taiwan's small salamander lives by mountain streams at an altitude of about 2,100 meters, or in the fallen leaves at the bottom of the forest. When it is young, it looks like a fish, breathing with gills, and only switches to breathing with lungs when it grows up. Although Taiwan's small sal...

sonani arisanensis Maki,1922

sonani arisanensis Maki,1922

sonani arisanensis Maki,1922,Taiwan small salamander, Alishan small salamander, earth dragon

Urodela LC

Features:The head is flat, and the trunk is about 3 times the length of the head; the tail ends in a blunt tip. The skin on the back of the body is smooth, with a longitudinal groove in the middle of the dorsal spine.

Alishan Small Salamander is an animal of the genus Small Salamander of the family Small Salamander. It lives in the middle and high mountainous areas with lush vegetation at an altitude of 2000 to 3650 m. Adults often live in slow-flowing streams under forests, swamps and places with rich mosses. Ad...

Batrachuperus yenyuanensis

Batrachuperus yenyuanensis

Batrachuperus yenyuanensis,Qianghuo fish

Urodela LC

Features:The body is slender, the tail is long, the tail muscles are weak, the back is dark brown or yellowish brown, and there are irregular light-colored cloud spots.

The ecological environment of the Yanyuan Mountain Stream Salamander is generally 1 to 2 meters wide and no more than 1/3 meter deep. There are relatively dense coniferous plants on both sides of the creek to cover the surface of the creek. There are large and small stones, gravel, coarse sand, dead...

Batrachuperus tibetanus

Batrachuperus tibetanus

Batrachuperus tibetanus,Giant salamander, Qianghuo fish, mountain pepper, fir fish

Urodela LC

Features:The back of the body has fine linen spots or no spots.

The Tibetan stream salamander is a tailed amphibian adapted to plateaus or cold mountain streams. It is distributed at an altitude of 1500 to 4300 meters, but mostly in mountain streams above 3000 meters. In areas with northern latitudes, the altitude is generally lower, such as the Nanjiang area of...

Batrachuperus pinchonii

Batrachuperus pinchonii

Batrachuperus pinchonii,Qianghuo fish, fir fish, white dragon

Urodela LC

Features:The body color varies greatly, the back is generally dark brown or brownish yellow, but there are also black gray, olive green or brown red;

The stream salamander is an amphibian of the genus Hynomaria, family Hynomaria. It lives in mountain streams at an altitude of 1500 to 3950 meters, where the water flow is relatively fast; the banks of the stream are mostly fir trees and shrubs, with many dead branches and fallen leaves, and there a...

Batrachuperus londongensis

Batrachuperus londongensis

Batrachuperus londongensis,Small giant salamander

Urodela LC

Features:The body is enlarged, the back and sides are dark brown, and some have irregular brown-yellow or orange-yellow spots.

Longdong Stream Salamander is a tailed amphibian of the family Hynomidae and the genus Hynomidae. It lives in spring caves at an altitude of about 1,200 meters and in the downstream river. The upper part of the river is deep, the lower part is open, the flow is fast, and there are many stones on the...

Batrachuperus londongensis

Batrachuperus londongensis

Batrachuperus londongensis,Qianghuo fish, fir fish, white dragon

Urodela LC

Features:The skin has no spots or patterns, the back of the body is dark brown or black gray, and the ventral side is slightly brighter.

The spotted stream salamander is a species of the genus Hynomialidae. This species has been included in the "List of Terrestrial Wildlife with Important Economic and Scientific Research Value under State Protection" issued by the State Forestry Administration of China on August 1, 2000.The...

Batrachuperus cochranae

Batrachuperus cochranae

Batrachuperus cochranae,Qianghuo fish, fir fish, white dragon

Urodela LC

Features:When alive, the back is yellowish brown, and except for the snout, it is scattered with dark brown spots. The spots are clearer in smaller ones; the belly is grayish yellow.

The weak-lipped stream salamander is a tailed amphibian of the family Hynomidae and the genus Hynomidae. It lives in high mountainous areas at an altitude of 3,500 to 3,900 meters, often inhabiting lush vegetation and extremely humid environments on the ground. It is often found in the moist environ...

Pseudohynobius shuichengensis

Pseudohynobius shuichengensis

Pseudohynobius shuichengensis

Urodela LC

Features:The entire back is purple-brown with no different colored markings.

The Shuicheng Salamander is a tailed amphibian of the family Salamanderidae and the genus Salamander. This species is similar to Pseudomonas maculata, but the body tail and the back of the limbs of this species are purple-brown without yellow patches; the limbs are long, and the front half of the pa...

Pseudohynobius kuankuoshuiensis

Pseudohynobius kuankuoshuiensis

Pseudohynobius kuankuoshuiensis

Urodela LC

Features:The whole body is engraved with dark colors.

The broadwater salamander is a tailed amphibian of the family Hynobiidae and the genus Hynobiidae. It is similar to the yellow-spotted Hynobiidae, but the dorsal patches of this species are nearly circular, and the head length is about 1.55 times the head width.This salamander lives in higher mounta...

Pseudohynobius jinfo

Pseudohynobius jinfo

Pseudohynobius jinfo

Urodela LC

Features:The back and tail are grayish yellow with dark brown spots, while the ventral side of the body is lighter in color.

The Golden Buddha's Pseudohylid Salamander lives in high mountainous areas with an altitude of 1980-2150m, where vegetation is lush. During the day, adults hide in the grass by the stream and move in the water at night. During the non-breeding season, adults stay away from water and live in a mo...

Pseudohynobius guizhouensis

Pseudohynobius guizhouensis

Pseudohynobius guizhouensis

Urodela LC

Features:The back is purple-brown with irregular orange-red or khaki-yellow nearly circular spots.

Juveniles live in the backwater of a stream, which is about 2.0m wide. There are dense bamboos and shrubs on the edge of the stream, covering the sky above the stream. Adults stay away from water during the non-breeding period and live on land, hiding in a cool and humid environment.Listed in the se...

Pseudohynobius flavomaculatus

Pseudohynobius flavomaculatus

Pseudohynobius flavomaculatus, baby salamander, baby salamander

Urodela LC

Features:When alive, the entire back side is purple-brown with irregular khaki or yellow spots, which are larger on the back and fewer or absent on the rear tail.

The yellow-spotted Hypoderma davidiana lives in high mountainous areas with an altitude of 1100 to 1845 meters. The mountains are covered with thorny bushes, bamboos, and weeds. There are abundant water sources, and the upper reaches of the ditches are mostly swamps. There are many limestone caves i...

Liua tsinpaensis

Liua tsinpaensis

Liua tsinpaensis

Urodela LC

Features:When alive, the head is brown with a few small golden spots, and the middle part of the body and tail is an irregular cloud of golden yellow and a few dark brown patches.

Habitat: This salamander lives in and near small mountain streams at an altitude of 1770-1860m. The stream has a small amount of water, a small slope, and many gravels on the bottom of the water. The streamside is mainly composed of herbaceous plants and shrubs.Habits: Adult salamanders live on land...

Liua shihi

Liua shihi

Liua shihi,Babirusa

Urodela LC

Features:It has a stout body, a flat head, smooth skin, and a round tail base that gradually flattens toward the back.

Habitat: This salamander lives in mountainous areas with an altitude of 900 to 2350m. Adults mostly live in small mountain streams, which are generally 1 to 2m wide and 10 to 25cm deep, with rich vegetation on both sides.Habits: Adult salamanders mainly feed on aquatic insects such as Trichoptera an...

Salamandrella keyserlingii

Salamandrella keyserlingii

Salamandrella keyserlingii,Water snake

Urodela LC

Features:The head is flat, the eyes are big, the tongue is big, the tail is flat and short, the skin is smooth and blue-brown, there are black vertical stripes on the head and the midline of the back, and the belly is light gray.

The Arctic salamander, also known as the water snake, can be called a "living fossil". It is an ancient rare animal with an evolutionary history of 230 million years. In April 2022, photography enthusiasts from Dongfanghong Forestry Bureau Co., Ltd. found two relatively rare Arctic salaman...

Salamandrella keyserlingii

Salamandrella keyserlingii

Salamandrella keyserlingii,Giant salamander, water lizard

Urodela LC

Features:It is afraid of heat and light, has a slim, round and slender body, a round and flat head, smooth and soft skin, four limbs, and looks very similar to a gecko.

The Xinjiang giant salamander is commonly known as the giant salamander or the water four-legged snake. It belongs to the class of amphibians, the order of caudate, the suborder of Cryptobrachiidae, and the family of Hynobiidae. It is an ancient rare animal that developed in the same era as dinosaur...