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A newt is a salamander in the subfamily Pleurodelinae. The terrestrial juvenile phase is called an eft. Unlike other members of the family Salamandridae, newts are semiaquatic, alternating between aquatic and terrestrial habitats. Not all aquatic salamanders are considered newts, however.
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.
Rough-skinned newt. The skin of salamanders, in common with other amphibians, is thin, permeable to water, serves as a respiratory membrane, and is well-supplied with glands. It has highly cornified outer layers, renewed periodically through a skin shedding process controlled by hormones from the pituitary and thyroid glands. During moulting ...
In newts and salamanders, metamorphosis is less dramatic than in frogs. This is because the larvae are already carnivorous and continue to feed as predators when they are adults so few changes are needed to their digestive systems. Their lungs are functional early, but the larvae do not make as much use of them as do tadpoles.
Salamanders and newts Fire salamander (Salamandra salamandra) — has bred at least once [citation needed] Alpine newt (Ichthyosaura alpestris) (naturalised) [1] Italian crested newt (Triturus carnifex) [2] Toads Midwife toad (Alytes obstetricans) (naturalised) [3] Yellow-bellied toad (Bombina variegata) — was naturalised but current status ...
Eastern newts have a number of natural predators, including fish, snakes, birds, and larger salamanders. They have several defenses against these predators, including their bright coloring, which serves as a warning signal, and their ability to secrete toxins from their skin as a defense mechanism.
The Japanese fire-bellied newt or Japanese fire-bellied salamander (Cynops pyrrhogaster) is a species of newt endemic to Japan. The skin on its upper body is dark and its lower regions bright red, although coloration varies with age, genetics, and region.
This is a list of amphibians of Pennsylvania as listed by the Pennsylvania Fish and Boat Commission. [1] Notes on ranges provided by Pennsylvania Amphibian & Reptile Survey . [ 2 ] Pennsylvania has 41 native species of amphibians, with 23 salamanders and newts, and 18 species of frogs and toads.