Giant salamander. The Cryptobranchidae are a family of fully aquatic salamanders commonly known as the giant salamanders. A single species, the hellbender (Cryptobranchus alleganiensis) occurs in the eastern United States, while Asian species occur in China and Japan. They are the largest living amphibians known today.
Cynops Tschudi, 1838 The fire belly newts or fire newts are a genus (Cynops) of newts native to Japan and China. All of the species show bright yellow or red bellies, but this feature is not unique to this genus. Their skin contains a toxin that can be harmful if ingested.
The fire salamander has live offspring and gives birth to 10 to 30 young at one time, according to the San Diego Zoo. Depending on the species, other salamanders lay up to 450 eggs at a time. The Santa Cruz long-toed salamander, for example, lays 200 to 400 eggs at a time according to the ADW.
Lungless salamander. The Plethodontidae, or lungless salamanders, are a family of salamanders. Most species are native to the Western Hemisphere, from British Columbia to Brazil, although a few species are found in Sardinia, Europe south of the Alps, and South Korea. In terms of number of species, they are by far the largest group of salamanders.
Among the largest of the salamanders, mudpuppies can exceed 16 inches in length, although the average is more like 11 inches. Their range runs from southern central Canada, through the midwestern United States, east to North Carolina and south to Georgia and Mississippi.
But Sirens have enough oddities and peculiarities to cause even staunch taxonomical "lumpers" to think twice concerning this animal's current classification with the salamanders. Sirens are probably the most ancient line of salamanders now alive on planet earth.