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The olm has three toes on its forelimbs, but only two toes on its hind feet. It exhibits neoteny, retaining larval characteristics like external gills into adulthood, [5] like some American amphibians, the axolotl and the mudpuppies (Necturus).
Salamanders range in size from the minute salamanders, with a total length of 27 mm (1 + 1 ⁄ 8 in), including the tail, to the Chinese giant salamander which reaches 1.8 m (6 ft) and weighs up to 65 kg (145 lb).
The olm (Proteus anguinus) of the western Balkan Peninsula. A cave salamander is a type of salamander that primarily or exclusively inhabits caves, a group that ...
Salamandridae is a family of salamanders consisting of true salamanders and newts. Salamandrids are distinguished from other salamanders by the lack of rib or costal grooves along the sides of their bodies and by their rough skin. Their skin is very granular because of the number of poison glands. They also lack nasolabial grooves.
The Texas blind salamander (Eurycea rathbuni) is a rare and endangered cave-dwelling troglobite amphibian native to San Marcos, Hays County, Texas, specifically the San Marcos Pool of the Edwards Aquifer. This species resembles the olm, another stygofaunal salamander from Europe. Unlike the olm, this amphibian's body is not as elongated, and ...
The Mexican salamander matures undergoes a process called neoteny, which means the animal matures without going through metamorphosis. While most tadpoles eventually get to walk on the land, the ...
Many species of salamander, and amphibians in general, exhibit environmental neoteny. Axolotl and olm are perennibranchiate salamander species which retain their juvenile aquatic form throughout adulthood, examples of full neoteny. Gills are a common juvenile characteristic in amphibians which are kept after maturation; examples are the tiger ...
The stalk is lined by many thinly walled filaments (fimbriae), containing the majority of blood vessels used in gas exchange. Animals usually have one external gill originating on each gill arch (except the hyoid), which leads to there being three pairs of external gills in salamanders, and four in the gilled larvae of lungfish.