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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. [6] 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.
The groove is lined with glands, and enhances the salamander's chemoreception which is correlated with a higher degree of olfactory lobe and nasal mucous membrane development in plethodontids. [3] [21] The presence of this specialized structure is likely related to the absence of lungs in these salamanders. Though some lunged salamanders do ...
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 ...
Eurycea longicauda, commonly known as the long-tailed salamander [4] or longtail salamander, [5] is a species of lungless salamander native to the Appalachian Region of the eastern United States. It is a " cave salamander " that frequents twilight zones of caves and also inhabits springs and surrounding forest.
The red-backed salamander (Plethodon cinereus) is a small, hardy woodland salamander species in the family Plethodontidae.It is also known as the redback salamander, [3] eastern red-backed salamander, [3] or the northern red-backed salamander to distinguish it from the southern red-backed salamander (Plethodon serratus).
The cave salamander or spotted-tail salamander (Eurycea lucifuga) is a species of brook salamander in the family Plethodontidae. [2]. It is well known for living in and around caves in the southeast United States. Adult cave salamanders are bright orange with black spots.
The newts do not migrate very far: they may cover around 100 metres (110 yd) in one night and rarely disperse much farther than one kilometre (0.62 mi). For orientation, the newts likely use a combination of cues including odour and the calls of other amphibians, and orientation by the night sky has been demonstrated in the marbled newt. [17]