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The term "newt" has traditionally been seen as an exclusively functional term for salamanders living in water, and not a clade. Phylogenetic analyses have however shown that species in the Salamandridae traditionally called newts do form a monophyletic group.
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.
Red-bellied newts can live for 20-30 years. [9] After reaching reproductive maturity, male red-bellied newts start congregating at stream banks as early as January or February. One to three weeks later, the females join them and the newts mate. [2] Red-bellied newts lay their eggs in fast-flowing streams or rocky rivers.
Within the smooth newt itself, genetic groups do not completely match the currently accepted subspecies (ampelensis, meridionalis, vulgaris), described based on morphology. [2] The five smooth newt species collectively were estimated to have diverged from the Carpathian newt around four to six million years ago. [13] [14]
The northern crested newt, great crested newt or warty newt (Triturus cristatus) is a newt species native to Great Britain, northern and central continental Europe and parts of Western Siberia. It is a large newt, with females growing up to 16 cm (6.3 in) long. Its back and sides are dark brown, while the belly is yellow to orange with dark ...
The California newt or orange-bellied newt (Taricha torosa), is a species of newt endemic to California, in the Western United States. Its adult length can range from 5 to 8 in (13 to 20 cm). [ 2 ] Its skin produces the potent toxin tetrodotoxin .
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. Adults are 8 to 15 cm (3.1 to 5.9 in) long.
The black-spotted newt (Notophthalmus meridionalus) is the largest extant member of the Notophthalmus genus. [3] It has a snout-to-vent length of 42–57 mm in adults, with females being the larger sex. [4] [5] The black-spotted newt grows to 7.4–10.9 centimetres (2.9–4.3 in) long and is typically an olive green in color with numerous black ...