Spotted paddle-tail newt
"Pachytriton" species are stout-bodied, smooth-skinned aquatic newts. Their heads are large and flattened, and they have conspicuous labial folds and short, stubby legs and toes. They breathe through both lungs and skin. 
"P. brevipes" ranges from 5.5 to 7.5 in as an adult. It has prominent labial folds, long digits, and smooth skin, which differs from the tuberculate skin typical of newts.
Italian crested newt
Temperature plays a key role in the osmoregulation of the newt. Not only do the changing seasons drive "T. carnifex" either into the water or onto land, it also regulates the release of certain hormones in accordance with the osmotic permeability of the newts' epidermis. Osmotic permeability is dependent on the release of hormones such as prolactin, vasotocin, as well as other thyroidal and internal hormones. Brown et al. experimented on a close relative of "T. carnifex" to determine the effects different environmental conditions have on the newts osmoregulatory systems.