Identification Characteristics:
The carapace is slightly arched with a smooth surface, featuring only a post-frontal ridge. The frontal region possesses oblique lateral margins, and the anterior frontal margin has a deep, central indentation, dividing it into two lobes. The anterolateral margins of the carapace are slender, appearing as a row of small nodules. The pereiopods (walking legs) are slender and long. The terminal abdominal segment of the male is triangular with a rounded apex and straight lateral margins. The carapace of live specimens exhibits a bright red coloration on the periphery, interspersed with dark purple in the central region. The chelipeds (claws) and the femur of the pereiopods are bright red.
Biology and Ecology:
This species inhabits mountain streams. It is typically found in soft-bottomed crevices under rocks along the stream banks.
Distribution:
- Vietnam: Nghe An (Dong Tam Ve), Thua Thien – Hue (A Luoi), South Central Coast (Phuc Son).
- Global: Endemic to Vietnam.
Value:
This is an endemic species, valuable for scientific study and as a food source.
Conservation Status:
The species has a narrow distribution in the Central Highlands, estimated to be under 20,000 km². The distribution area is fragmented. Studies conducted in 2000-2001 in A Luoi, Thua Thien – Hue, indicated that the species is heavily exploited by local people for food.
Assessment:
VU (Vulnerable) B1+2a,b,e.
Conservation Measures:
It is listed in the Vietnam Red Data Book. Recommendations include limiting exploitation and further research into its biology and ecology.