Newt
Newts, as with salamanders in general and other amphibians, serve as bioindicators because of their thin, sensitive skin and evidence of their presence (or absence) can serve as an indicator of the health of the environment. Most species are highly sensitive to subtle changes in the pH level of the streams and lakes where they live. Because their skin is permeable to water, they absorb oxygen and other substances they need through their skin. Scientists study the stability of the amphibian population when studying the water quality of a particular body of water.
Neurergus
Neurergus is a genus of salamanders, more specifically newts, in the family Salamandridae. They are found in the Middle East (predominantly in Turkey and Iran), and are bred in captivity for their bright colors. In nature, they inhabit streams and small rivers, and the surrounding forests or shrublands. All of the "Neurergus" are considered threatened species, primarily due to destruction of habitat.