Subfamily ARCOSCALPELLINAE Zevina, 1978

Zevina, 1978b: 1347.

Type genus: Arcoscalpellum Zevina, 1978b .

Amended diagnosis. Scalpellidae with C not angularly bent, umbo apical or slightly subapical, plates fully calcified, approximate, 12–14 in number, 13 when R or 12 when L2s are missing, respectively.