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
The skin of "T. carnifex" is a highly permeable structure, because it is the source of osmoregulation. Due to their skins' ability to absorb water, these newts do not need to drink. "T. carnifex"’s epidermis is divided into three separate cell layers: the stratum corneum, the outer layer, which consists of keratinized cells, the stratum intermedium, the middle layer, which consists of polyhedral cells, and the stratum germinativum, the basal side layer, which consists of a single row of cells. The first layer of cells contains three adaptive characteristics that help protect the epidermal layers. The inner portion of the integument consists of the connective tissue that makes up the dermis layers. This includes the stratum spongiosum, which is made up of loose tissue containing collagen, elastic fibers, blood vessels, glanular and muscous glands, and the stratum compactum, which consists of dense collegen fibers in bundles lying on the inside. The stratum spongiosum is closer to the surface. Altogether, this layer measures 5 micrometers. The thickness and resistance of this layer, combined with the filamentous network of keratin, interfilamentous intermatrix, and the intercellular substance produced by the kerinocytes all help to reduce chemical and physical damage to the underlying tissues and all help to keep a constant internal environment. However, water is still able to get through the layers of the epidermis. Keratinocytes are especially important to the newt’s physiological well-being because they are responsible for the absorption of sodium ions. When it comes time to shed the skin, these cells will thicken and flatten out and eventually become the skin the newt sheds. Since highly permeable skin is a favourable adaption this is the main source of osmoregulation in crested newts.