Overview
The Many-lined Salamander (Stereochilus marginatus) is a small, specialized lungless salamander that represents a monotypic evolutionary genus endemic strictly to the Atlantic Coastal Plain of the southeastern United States. Inhabiting saturated, tea-colored blackwater seepage zones, this secretive amphibian remains concealed beneath submerged peat and sphagnum moss, serving as a critical indicator of hydric coastal plain wetland integrity.
Biology and Physical Characteristics
Stereochilus marginatus is characterized by an elongated, cylindrical body with 16 to 18 costal grooves, slender limbs, and a laterally compressed tail tailored for aquatic locomotion. Its dorsal coloration is a subtle dull brownish-yellow to olive, accented along each flank by a distinctive series of fine, dark brown longitudinal lines that merge near the belly. Like all plethodontids, it lacks lungs and gills as adults, respiring entirely through cutaneous gas exchange across its thin, mucosal skin.
Behavior and Ecology
Primarily nocturnal and highly secretive, the many-lined salamander rarely ventures onto dry land, spending its life cycle within flooded leaf muck and dense submerged vegetation in cypress swamps. During winter breeding, males utilize chin mental glands to deliver chemical pheromones to females. Females deposit small clutches of eggs individually affixed to the undersides of submerged logs or water mosses, guarding them until gilled aquatic larvae emerge in early spring.
Conservation and Human Impact
Evaluated as Least Concern by the IUCN, Stereochilus marginatus remains locally abundant within extensive public lands such as the Great Dismal Swamp and Okefenokee National Wildlife Refuges. Threats arise primarily from coastal wetland ditching, agricultural drainage, and commercial pine plantation bedding that alter natural water tables and eradicate peat microhabitats.
Interesting Factoid
Unlike most terrestrial woodland salamanders, the many-lined salamander retains a laterally flattened, finned tail throughout adulthood, functioning as a proficient underwater swimmer in shallow swamp seepages.
Last updated: October 2026