Genus Planoscalpellum Zevina, 1978

Arcoscalpellum Hoek, 1907: 85 (part).

Planoscalpellum Zevina, 1978b: 1347.

Diagnosis.

Upper latus with umbo on scutal margin; inframedian latus with umbo apical or sub-basal; carinal latus with umbo on carinal part, may be protruding.

Type species.

Scalpellum planum Hoek, 1883; type locality: 42°42'S, 134°10'E; depth: 4,755 m; bottom temperature: 0.2 °C; bottom: red clay.