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The external gills seen in salamanders differs greatly from that of amphibians with internalized gills. Unlike amphibians with internalized gills which typically rely on the changing of pressures within the buccal and pharyngeal cavities to ensure diffusion of oxygen onto the gill curtain, neotenic salamanders such as Necturus use specified ...
Plethodontidae, or lungless salamanders, are a family of salamanders. [ 1 ] [ 2 ] With over 500 species, lungless salamanders are by far the largest family of salamanders in terms of their diversity. Most species are native to the Western Hemisphere , from British Columbia to Brazil.
External gills are the gills of an animal, most typically an amphibian, that are exposed to the environment, rather than set inside the pharynx and covered by gill slits, as they are in most fishes. Instead, the respiratory organs are set on a frill of stalks protruding from the sides of an animal's head. The axolotl has three pairs of external ...
Amphiuma is a genus of aquatic salamanders from the United States, [2] the only extant genus within the family Amphiumidae / æ m f ɪ ˈ juː m ɪ d iː /. [3] They are colloquially known as amphiumas. [2]
[15] [16] The common mudpuppy never leaves its aquatic environment and therefore does not undergo morphogenesis; however, many salamanders do and develop differentiated teeth. [17] Aquatic salamander teeth are used to hinder escape of the prey from the salamander; they do not have a crushing function. [17] This aids the salamander when feeding.
[13] [14] External gills are usually lost when salamander species mature into adulthood, although the axolotl maintains this feature. [15] This is due to their neoteny evolution, where axolotls are much more aquatic than other salamander species. [16] Their heads are wide, and their eyes are lidless.
Latin had the name stellio for a type of spotted newt, now used for species of the genus Stellagama. Ancient Greek had the name κορδύλος, presumably for the water newt (immature newt, eft). [7] German has Molch, from Middle High German mol, wikt:olm, like the English term of unknown etymology.
Bolitoglossa is a genus of lungless salamanders, also called mushroom-tongued salamanders, [1] tropical climbing salamanders, [2] or web-footed salamanders, [3] in the family Plethodontidae. [ 1 ] [ 4 ] Their range is between northern Mexico through Central America to Colombia , Venezuela , Ecuador , Peru , northeastern Brazil , and central ...