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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.
Eastern newts have a lifespan of about 8–10 years in the wild, but some individuals have been known to live up to 15 years. [8] Eastern newts have three stages of life: (1) the aquatic larva or tadpole, (2) the red eft or terrestrial juvenile stage, and (3) the aquatic adult.
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]
Marbled salamander: Adults are 3.5 to 5 inches (8.9 to 12.7 cm) long and are colored black or dark gray with white or gray markings. Considered an endangered species in Michigan. [3] Ambystoma texanum: Small-mouth salamander: Adults are 4.3 to 7 inches (11 to 18 cm) long and are colored black, gray or brown. Considered an endangered species in ...
List of Minnesota amphibians lists all of the salamanders, ... Central newt: Notophthalmus viridescens ... Checklist of Amphibian Species and Identification Guide;
Seventy-one amphibian species are found in the American state of Texas, including forty-four species of frog and twenty-eight species of salamander. Four species are categorized as endangered by the International Union for Conservation of Nature: the Barton Springs salamander, the Texas blind salamander, the black-spotted newt, and the Houston ...
The male red-bellied newt often has a dark, broad coloring across the vent, while females do not. [3] Breeding males develop smooth skin and a flattened tail. The red-bellied newt can be distinguished from other coastal newts by its red belly and a lack of yellow in its eyes.
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 ...