5. Notomastus annenkovae Zachs, 1933

Notomastus (Clistomastus) annenkovae Zachs, 1933: 131 .

Type material: Not found. Type locality: North Japan Sea .

Records: Only known from the type locality.

Remarks: Original description by Zachs (1933) is very brief with few details about the morphology, and illustrations were not included. It is desirable to locate the type material or to review topotypes in order to redescribe the species properly.