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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 ...
[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.
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.
Specimen from the Pacific Lutheran University Natural History collection. Mudpuppies use rows of teeth to eat their prey. [5] Salamanders have three different sets of teeth: dentary, premaxillary, and vomerine teeth, which are named due to their location in the mouth. [14] All the teeth, despite their different locations, are very similar.
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]
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 ...
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 ...
The olm (German: ⓘ) or proteus (Proteus anguinus) is an aquatic salamander which is the only species in the genus Proteus of the family Proteidae [2] and the only exclusively cave-dwelling chordate species found in Europe; the family's other extant genus is Necturus.