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Amphibians are ectothermic, anamniotic, four-limbed vertebrate animals that constitute the class Amphibia. In its broadest sense, it is a paraphyletic group encompassing all tetrapods excluding the amniotes (tetrapods with an amniotic membrane, such as modern reptiles, birds and mammals).
This muscle system allows the animal to anchor its hind end in position, and force the head forwards, and then pull the rest of the body up to reach it in waves. In water or very loose mud, caecilians instead swim in an eel-like fashion. [15] Caecilians in the family Typhlonectidae are aquatic, and the largest of their kind. The representatives ...
Astylosternus robustus. The hairy frog (Trichobatrachus robustus) also known as the horror frog or Wolverine frog, is a Central African species of frog in the family Arthroleptidae. It is typically considered monotypic within the genus Trichobatrachus, [ 2 ] but based on its genetics, it should be included in Astylosternus instead. [ 3 ]
Suborders. Cryptobranchoidea Salamandroidea. Native distribution of salamanders (in green) Salamanders are a group of amphibians typically characterized by their lizard -like appearance, with slender bodies, blunt snouts, short limbs projecting at right angles to the body, and the presence of a tail in both larvae and adults.
Amphibians are notable as remnants of the first vertebrates capable of surviving in both aquatic and terrestrial environments. [1] The embryonic development of tailless amphibians is presented below using the African clawed frog ( Xenopus laevis ) and the northern leopard frog ( Rana pipiens ) as examples.
Mammal. A mammal (from Latin mamma 'breast') [1] is a vertebrate animal of the class Mammalia (/ məˈmeɪli.ə /). Mammals are characterized by the presence of milk -producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair, and three middle ear bones.
In zoology, a scale (Ancient Greek: λεπίς, romanized: lepís; Latin: squāma) is a small rigid plate that grows out of an animal 's skin to provide protection. In lepidopterans (butterflies and moths), scales are plates on the surface of the insect wing, and provide coloration. Scales are quite common and have evolved multiple times ...
A common bottlenose dolphin (Tursiops truncatus). A dolphin is an aquatic mammal in the clade Odontoceti (toothed whale).Dolphins belong to the families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the New World river dolphins), Pontoporiidae (the brackish dolphins), and possibly extinct Lipotidae (baiji or Chinese river dolphin).