Gatunek typowy
Ranella longispina Eudes−Deslongchamps, 1842. Bajocian (Mid  Jurassic), Bayeux, Calvados, France.

Opis

Medium−sized shell, rather slim. Whorls curved, usually angulated, with spiral lirae and varices symetrically situated on both sides. Every varix is armored with straight, long, and perpendicularly oriented prickle. Base of body whorl somewhat concave. Peristome small, with very long, straight rostrum, with gutter closed by rolled up edge. Outer lip not widened, armored with long, narrow, perpendicular prickle, which extending inside gutter reaching up to end. Columella straight, smooth. Inner lip not clearly delimited.

Synonimy

Zasięg czasowy

Toarcian–Oxfordian (Early to Late Jurassic).

Literatura

d’Orbigny, A. 1850a. Terrains Jurassiques. Paléontologie Française 2, 1–621.

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