Gatunek typowy

Opis

Rostellaria hamulus Eudes-Deslongchamps, 1843; Bathonian, France.
Diagnosis: The shell with slender spire ornamented by spiral lines crossed by more or less inclined and discontinuous axial ribs, strongest on the median corner where they form a narrow wing. The wing is pointed, grooved on its lower side and curved in apical direction. . A second rib on the whorl may be present. The siphon is spine-like and curved. The teleoconch consists of about 11 whorls, in which ornament changes from axial ribs to spiral keels. The protoconch has a low dome-shaped embryonic whorl and a conical larval shell with rounded whorls, and is more than 1 mm high with 3.5 to 4 whorls. The larval shell has a wide upper sinus and a lobe that is covered by the succeeding whorl. 

Synonimy

Zasięg czasowy

Jurassic

Literatura

Cossmann, M. 1904. Essais de paléoconchologie comparée, vol. 6. 151 pp. F.R. de Rudeval, Paris.