GENUS SCALPELLUM LEACH, 1817

Type species

Lepas scalpellum Linnaeus, 1767, by subsequent designation, Leach 1824.

Diagnosis

Derived scalpellines in which the carinal and scutal umbones are subapical, the carinolatus has a hornlike projection, often recurved, extending beyond the carinal margin, the inframedian latus is rectangular to slightly trapezoidal, with a low umbo, and the upper latus is rhomboidal with a subapical umbo; rostrum rectangular, pyramidal, with large subumbonal surface.

Included species

Lepas scalpellum Linnaeus, 1767, Scalpellum stearnsi Pilsbry, 1890, Scalpellum gibbum Pilsbry, 1907, and Tarasovium orientale Ren, 1983 .

Remarks

Scalpellum evolved in the Eocene from Arcoscalpellum, and a transition series is presented here (Figs 16, 17; see above).