Genus Trianguloscalpellum Zevina, 1978

Arcoscalpellum Hoek, 1907: 85 (part).— Pilsbry, 1907: 47.— Newman & Ross, 1971: 42 (part). Trianguloscalpellum Zevina, 1978b: 1349 .— Liu & Ren, 1985: 205.

Diagnosis. Capitulum with 13 or 14 plates; CL triangular, umbo apical; L2 triangular or rectangular, umbo apical, reaching L1.