Gatunek typowy
Rissoa pusilla Philippi, 1836. Recent, Mediterranean Sea.

Opis

Shell minute to small, ovate to conical, with or without umbilicus, smooth or, typically, with axial ribs stronger than spiral sculpture; axial ribs usually obsolete on base. Aperture with simple peristome, inner lip narrow, attached to parietal wall, anterior end rounded, simple. Outer lip opisthocline to prosocline, with or without external varix. Protoconch 2 of 1.5 to 2.25 whorls, smooth or with spiral threads or spiral rows of minute, closely spaced pustules.

Synonimy

Zasięg czasowy

Oxfordian (Late Jurassic) to Recent.

Literatura

Kaim, A. 2004. The evolution of conch ontogeny in Mesozoic open sea gastropods. Palaeontologia Polonica 62, 3–183.

Monterosato T. A.1884. Nomenclatura generica e specifica di alcune conchiglie mediterranee. Palermo, Virzi, 152 pp.