Identification:
- Medium-sized clam with a rectangular, robust shell. The umbo region has a convex shell. The dorsal margin is straight and slopes towards the anterior. The anterior margin is rounded, while the ventral margin is nearly straight.
- The shell surface is smooth, brown or black in color. The nacre is white with an orange border.
Biology and Ecology:
- Inhabits sandy-mud substrates of riverbeds.
Distribution:
- Vietnam: Lạng Sơn Province (Mẫu Sơn mountainous region).
- Global: Endemic to Vietnam.
Value:
- Of scientific and food value.
Status:
- The description is based on Haas (1939), with specimens collected from rivers in the Mẫu Sơn mountainous region of Lạng Sơn. Information is currently lacking regarding the population size and distribution of this species. No recent specimens have been collected.
- IUCN Red List Category: DD (Data Deficient).
Conservation:
- Listed in the Vietnam Red Data Book and on the pre-1996 list of protected species by the fisheries sector. Recommended actions: Conduct surveys and further research on the distribution and population size of this species in rivers within Lạng Sơn Province.