Water newt : Any one of numerous species of aquatic salamanders; a triton.

Example:


Taxonomy
newts, species, spp, family Salamandridae, eft, toxins, Pleurodelinae, subfamily, salamanders, adult, lizard, Amphibia, crested newts, free encyclopedia, amphibian, etymology, limbs, external gills.

Defination from the web:
newts have lizard-like bodies and may be either fully aquatic, living permanently in the water, or semi-aquatic, living terrestrially but ... The term "newt" has traditionally been seen as an exclusively functional term for salamanders living in water, and not a systematic unit. ...