Gatunek typowy

Opis

Type species: Trochus duplicatus Sowerby, 1817; Bajocian, England.
Shell trochiform, with conical spire and depressed, concave base; narrowly phaneromphalous; last whorl with prominent periphery formed by two conspicuous nodose cords, one or both exposed on spire whorls just above suture which is bordered by further nodose cord; crenulated or nodose carina at umbilical margin; aperture quadrate.

Synonimy

Zasięg czasowy

Upper Triassic (Norian) to Late Cretaceous (Neocomian).

Literatura

Thiery, P. & Cossmann, M. 1907. Note sur le Callovien de la Haute Marne et spécialement sur le gisement situé dans la commune de Bricon. Bulletin Société d’agricultures, lettres, sciences et arts département Haute-Saône, Vésoul 1907, 69–147.