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Southern dwarf siren
The southern dwarf siren (''Pseudobranchus axanthus'') is a perennibranch salamander lacking hind legs. Found exclusively in Florida, it is one of two currently recognized species of dwarf sirens. Two subspecies are currently recognized; ''P. a. axanthus'', the narrow-striped dwarf siren, and ''P. a. belli'', the Everglades dwarf siren.
==Physical description==
Southern dwarf sirens are thin, slimy salamanders that are frequently mistaken for eels. they have long bodies with bushy gills and small, three-toed fore legs. Coloration is generally brown, black, or gray, with yellow or tan stripes on their backs and sides. Adults reach a length of 10–25 cm.
Southern dwarf sirens can easily be distinguished from amphiumas by size and the presence of hind legs, and from ''Siren'' spp. salamanders by the presence of three toes on each foot. Distinguishing between ''P. axanthus'' and ''P. striatus'' is more difficult, requiring comparison of patterns with a field guide, known distribution, or a karyotype test. ''P. axanthus'' has 32 chromosomes, while ''P. striatus'' has 24. A costal groove count may assist in differentiating ''P. a. axanthus'' and ''P. a. belli'', as the former has 34–37 costal grooves, while the latter has 29–33 (Petranka, 1998).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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