Geoje Salamander

A small, slender salamander typically measuring 3.5–5.0 inches (9–13 cm) in total length. Body is elongate and gracile with relatively short limbs and a long tail comprising approximately half of total length. Dorsal coloration is dark brown to nearly black, often with a russet or reddish-brown tinge, particularly along the vertebral region. The dorsal surface may exhibit fine flecking or a subtle marbled pattern of lighter brown mottling. Dorsolateral folds are weakly developed or absent. The head is small and flattened, with a rounded snout. Costal grooves are typically 14–15 in number. Skin texture is smooth and somewhat glossy. The tail is slightly compressed laterally and uniform in coloration throughout. Ventral surface is dark brown to black, sometimes with lighter spotting on the throat and underside of the tail. A key diagnostic feature is the presence of a pale stripe or line running along the inner aspect of the hind limbs. Confined to small forest streams, seepage areas, and cool, mossy microhabitats associated with rocky substrates and leaf litter in forested regions of Geoje Island, South Korea. This species is highly aquatic compared to some congeners, frequenting water-adjacent refugia. Diet consists of small aquatic and semi-aquatic invertebrates including amphipods, small insects, and microcrustaceans.

Similar species: Hynobius leechii differs by having a more pronounced marbled pattern and occurring in different geographic regions; Hynobius reiseri differs by its slightly larger size and more pronounced dorsolateral grooves; Hynobius nauleri differs by its lighter dorsal coloration and occurrence in different drainage systems.