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
There will be a variation in water loss and gain between newts in the aquatic, or winter phase, and the terrestrial, or summer phase. In the terrestrial environment, there will be a change to the integument that will directly affect osmoregulatory mechanisms. This change is the shift from a smooth, mucosal skin surface to one that is rough and dry. This change is to allow easier transport of water through the cutaneous membrane and into the newt to allow for hydration. A mucosal surface is difficult for substances to get through, and is generally attributed to an animal to prevent transport across the epithelium.