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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.
The eastern newt (Notophthalmus viridescens) is a common newt of eastern North America.It frequents small lakes, ponds, and streams or nearby wet forests. The eastern newt produces tetrodotoxin, which makes the species unpalatable to predatory fish and crayfish. [3]
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 ...
The anal opening is a longitudinal slit, and its borders are not raised. The skin is rough and the parotoid glands are large. There is a strong fold on the chin. The entire newt is uniformly blackish brown, slightly paler on the lips, snout, chin, throat, and under surface of limbs. The lower edge of the tail is orange-yellow. [3]
List of Minnesota amphibians lists all of the salamanders, ... Central newt: Notophthalmus viridescens ... Checklist of Amphibian Species and Identification Guide;
[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.
The southern banded newt (Ommatotriton vittatus) is a species of salamander in the family Salamandridae found in Armenia (Lori Province of northern Armenia), Iraq, Israel, Jordan, Lebanon, Syria, and Turkey. This species has two subspecies - O. v. vittatus (found in Turkey, Syria, and Israel) and O. v. ciliensis (found in Turkey). [2]