Plestiodon tetragrammus


The four-lined skink is a species of lizard, which is endemic to North America. It is a medium-sized member of the Plestiodon skinks.

Taxonomy

At least two subspecies are recognized, including the nominotypical subspecies:
  • Long-lined skink, P. t. tetragrammus Baird, 1859
  • Short-lined skink, P. t. brevilineatus
Some herpetologists also consider the mountain skink to be a subspecies of Plestiodon tetragrammus under the name P. t. callicephalus. Others, however, prefer to treat the mountain skink as a distinct species because its range is geographically distinct and there are morphological differences.

Description

The two subspecies can be distinguished by their color and their stripes. The long-lined skink is gray to light brown in color and has light stripes from the eyes extending to beyond its forelegs, whereas the short-lined skink is darker in color and has stripes that end before the forelegs.
Juveniles of both subspecies have — like many Plestiodon — a blue tail; this color fades with age.
Adults reach a maximum SVL of some 7.5 cm, and a TL of about.

Geographic range

Plestiodon tetragrammus occurs in northern Mexico and along the Mexican Gulf coast and in western and central Texas.

Habitat

Both subspecies live in lightly wooded areas, with the short-lined skink having a preference for rocky areas, whereas the long-lined skink is also found in grasslands.

Reproduction

The female lays about 5 to 12 eggs once a year, which she broods. Males develop orange to red coloration of the head during the breeding season.