Rhombuniopsis heres – Rare Extinct Unionidae from Yunnan Plateau

Rhombuniopsis heres, an extinct species from Yunnan Province, China, belongs to a rare and distinctive genus, now entirely extinct. This species was confined to a single lake on the Yunnan Plateau, making it exceptionally rare. Complete dead shells are seldom found, and specimens with preserved periostracum are even rarer. This mollusk offers immense value for scientific research into extinction and freshwater ecosystems.