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Georgetown salamander
The Georgetown salamander or San Gabriel Springs salamander (''Eurycea naufragia'') is a species of salamander in the family Plethodontidae. It is endemic to springs in Williamson County, Texas, near Lake Georgetown.〔 It inhabits freshwater springs and, possibly, caves. It is threatened by habitat loss. Many of the springs where this species formerly lived have been destroyed by development, including creation of Lake Georgetown.〔 The specific name (which means "remnants" in Latin) refers to the few remaining remnants of habitat for this species.〔
==Description==
Georgetown salamanders are small, permanently aquatic salamanders. Adults are typically in length and less than 0.5 cm in diameter. Although their coloration varies, most adults are dark brown, dark olive, or gray. Juveniles tend to be darker in color. Coloration is confined to the dorsal and lateral sides of the body; the ventral surface is usually translucent. Many individuals have a light, cream- or yellow-colored stripe on the top of the tail.
The head is roughly shovel-shaped, broad but relatively short, and widest at the point where the upper and lower jaws meet. Three prominent external gills—often deep red in color—extend from each side of the head. The eyes are relatively large and have gold-colored irises. Black melanophores are concentrated around each eye, forming a black circle around the eye and a black line that runs from the corner of the eye to the nasal opening. There are 14-16 costal grooves, counting those in the fore limb and hind limb regions.〔 Chippindale et al. (2000)〔 described the osteology of the species and how it differs from that of ''E. tonkawae'' and ''E. chisholmensis''.
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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