| abstract | Unionicola lumbria Wen & Zhu 1998 is re-evaluated and placed in a new subgenus Vidrinatax erected of the genus Unionicola Halderman 1842. Vidrinatax is intermediate in morphology between the subgenus Pentatax Thor 1922 and Causeyatax Vidrine 1994. Two new species, U agilex sp. nov. and U brevipedalis sp. nov., in the genus Unionicola, are described from freshwater Bivalves, Anodonta woodiana woodiana (Lea, 1834) (Bivalvia: Unionidae), which belong to subgenus hidrinatax and Vietsatax Uchida & Imamura 1938 respectively. |