By an odd coincidence I was reading the "NATIONAL AUDUBON SOCIETY FIELD GUIDE TO NORTH AMERICAN REPTILES AND AMPHIBIANS" this morning over breakfast so I have it handy.
The dwarf siren is the Psuedobranchus striatus and has 5 subspecies, broad-striped, slender, narrow-striped, gulf hammock, and everglades. It is the smallest of the sirens and ranges as an adult from 4" to 10" long. The light stripes on it's sides are permanent as are the external gills. It has three toes on it's feet. It breeds in spring and lays its eggs singly on the roots of water plants. It is fully aquatic.
It is native to S. Carolina, Georgia, and Florida, and likes weedy swamps, ponds and ditches, esp. those with water hyacinth. They can estivate trough dry seasons by forming a mud and mucus cacoon.
They eat small insects, snails, fish and some algae. In captivity they have been known to live 25 years.
I have never found any of the sirens for sale but I recently found a medical supply house that sell the larger 2 toed amphiumas for $10-12 ea. If interested hit the search button above and look for "congo eels for sale", as soon as I get an appropriate tank going I am getting one.