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A sexually mature adult axolotl, at age 18–27 months, ranges in length from 15 to 45 cm (6 to 18 in), although a size close to 23 cm (9 in) is most common and greater than 30 cm (12 in) is rare. Axolotls possess features typical of salamander larvae, including external gills and a caudal fin extending from behind the head to the vent.
[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.
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. All ten extant salamander families are grouped together under the order Urodela from the group Caudata. [2]
Proteid salamanders range in size from 28 centimetres (11 in) to 40 centimetres (16 in) in length. [5] Members of the genus Necturus, commonly called "mudpuppies" or "waterdogs", prefer shallow lakes and streams that have slow moving water and rocks to hide under, but have been found in up to 90 feet of water. [6]
At a temperature of 10 °C (50 °F), the olm's embryonic development (time in the eggs before hatching) is 140 days, but it is somewhat slower in colder water and faster in warmer, being as little as 86 days at 15 °C (59 °F). After hatching, it takes another 14 years to reach sexual maturity if living in water that is 10 °C (50 °F).
Both males and females grow to an adult length of 24 to 40 cm (9.4 to 15.7 in) from snout to vent, with a total length of 30 to 74 cm (12 to 29 in), making them the fourth-largest aquatic salamander species in the world (after the South China giant salamander, the Chinese giant salamander and the Japanese giant salamander, respectively) and the ...
The largest South China giant salamander, which researchers said is likely the largest amphibian ever recorded, lived during the first half of the 20th century and was housed at the London Zoo for ...
The adults and juveniles tend to be restricted to the stream edges, hiding under rocks and other debris during the day. [18] Seasonal migration does occur, but not all individuals undertake them. Research done in Quebec suggests a postbreeding migration into the forest occurs in June. These adult salamanders may move over 100 m from the stream.
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