How to Identify the Glossy Crayfish Snake (Identification Guide)

Key identifying features

The glossy crayfish snake (Liodytes rigida, formerly Regina rigida) is identified by its smooth, highly glossy dark olive-brown to brown back, a keeled but shiny appearance, and a pale yellow belly marked with two rows of small dark crescent or half-moon spots down its length. The glossy sheen and belly spotting together are the most useful field marks.

Coloration & pattern

The dorsal color is dark olive, brown, or blackish-brown, often appearing almost unpatterned but sometimes showing faint darker longitudinal striping when viewed closely. Despite having keeled scales, the body has a notably glossy, shiny appearance compared to many other water snakes. The belly is pale yellow to cream with two rows of small dark, crescent-shaped spots running down its center.

Head, eyes & scales

The head is small and only slightly wider than the neck, dark like the body with little contrasting pattern. Eyes are small to moderate with round pupils. Scales are keeled but smooth-looking due to the glossy sheen, an unusual combination among natricine snakes.

Size & body shape

Adults typically measure 35 to 56 cm (14 to 22 inches), with a moderately stout, cylindrical body adapted for a highly aquatic, burrowing lifestyle in mucky wetland substrates.

Range & habitat where you'll see it

This species is found in the southeastern United States, from the Carolinas south through Florida and west to Louisiana and Texas, inhabiting swamps, marshes, ditches, and other still, mucky waters rich in crayfish burrows. It is highly secretive and rarely seen on the surface, often remaining within crayfish burrows or under aquatic debris, and is more often found by turning cover near water than by casual observation.

How to tell it apart from look-alikes

Graham's crayfish snake and the queen snake both show a distinct pale lateral stripe, which the glossy crayfish snake generally lacks or shows only faintly, instead relying on its glossy, dark, near-uniform back and spotted belly for identification. Watersnakes in the genus Nerodia are typically larger, more heavily blotched, and duller in sheen. The combination of a shiny, dark, mostly unstriped back with a crescent-spotted yellow belly is the best way to separate this species from other crayfish-eating water snakes.