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
"T. carnifex" displays a unique hemoglobin and red blood cell (RBC) adaptation in their circulatory system. When newts are induced into anemia, they are able to respire without the need of blood cells, or their body making blood cells. Instead, around two weeks after anemia is induced "T. carnifex" produces a mass of cells that helps to revitalize the already circulating red blood cell mass. Casale et al. found that red blood cells of the newt not only produce hemoglobin, but also ferritin, ribosomal proteins, and proteins assumed to be catalase. These extra proteins were produced in high concentrations in early RBC, but decrease quickly as the cell matures. Casale et al. also found that although hemoglobin production decreases as the RBC matures, the cell creates more protein to aid in hemoglobin production.