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In the lungless salamanders (family Plethodontidae and the clawed salamanders in the family of Asiatic salamanders), no lungs or gills are present, and gas exchange mostly takes place through the skin, known as cutaneous respiration, supplemented by the tissues lining the mouth. To facilitate this, these salamanders have a dense network of ...
Small-mouth salamanders are nocturnal, often subterranean, preferring moist habitats near permanent bodies of water. Breeding occurs in the spring, with groups of salamanders congregating near the water. Females can lay up to 700 eggs, which they attach in small clumps of up to 30 eggs at a time, to rocks or vegetation under the water.
Primarily nocturnal, it is commonly found under rocks, or other ground debris in moist, wooded areas. Eggs are laid in damp protected locations. The species has no aquatic larval stage. They are a shy species of salamander and are not normally found in areas where humans frequent. They live in areas of high humidity levels.
[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.
Crepuscular, a classification of animals that are active primarily during twilight, making them similar to nocturnal animals. Diurnality, plant or animal behavior characterized by activity during the day and sleeping at night. Cathemeral, a classification of organisms with sporadic and random intervals of activity during the day or night.
The hellbender (Cryptobranchus alleganiensis), also known as the hellbender salamander, is a species of aquatic giant salamander endemic to the eastern and central United States. It is the largest salamander in North America. A member of the family Cryptobranchidae, the hellbender is the only extant member of the genus Cryptobranchus.
Cryptobranchids are large and predominantly nocturnal salamanders that can reach a length of 1.8 m (5.9 ft), though most are considerably smaller today. [1] Despite being aquatic, they are poor swimmers and mostly just walk on the bottom.
This large salamander grows to a total length (including tail) of 29–57 cm (11–22 in) over a lifespan of 30 years. [6] The Ozark hellbender is a nocturnal predator that hides under large flat rocks and primarily consumes crayfish and small fish.