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skink
Skinks are lizards belonging to the family Scincidae and the infraorder Scincomorpha. With more than 1,500 described species, the Scincidae are one of the most diverse families of lizards.
==Description==
Skinks look roughly like true lizards, but most species have no pronounced neck and their legs are relatively small; several genera (e.g., ''Typhlosaurus'') have no limbs at all. Other genera, such as ''Neoseps'', have reduced limbs, lacking forelegs, and with fewer than five toes (digits) on each foot. In such species, their locomotion resembles that of snakes more than that of lizards with well-developed limbs. As a general rule, the longer the digits, the more arboreal the species is likely to be. A biological ratio can determine the ecological niche of a given skink species. The Scincidae ecological niche index is a ratio based on anterior foot length at the junction of the ulna/radius-carpal bones to the longest digit divided by the snout-to-vent length.〔Schnirel, Brian (2004) SENI biometric analysis on the extinct Scincidae species: Macroscincus coctei. Polyphemos, Volume 1, Issue 2, May, Florence, South Carolina, U.S.A. pp. 12-22.〕
Most species of skinks have long, tapering tails they can shed if predators grab onto them. Such species generally can regenerate the lost part of a tail, though imperfectly. Species with stumpy tails have no special regenerative abilities.
Some species of skinks are quite small; ''Scincella lateralis'' typically ranges from , more than half of which is the tail. Most skinks, though, are medium-sized, with snout-to-vent lengths of about , although some grow larger; the Solomon Islands skink, ''(Corucia zebrata)'', is the largest known extant species and may attain a snout-to-vent length of some .
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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