Gatunek typowy
Crania spiculata Rowley, 1908; Carboniferous, Mississippian; Buffalo Creek, Louisiana, USA

Opis

Dorsal valve convex to subconical with ornament of fine papillae disposed concentrically with coarser, hollow spines; beak excentric and posterior face normally steep; anterior adductor scars larger than posterior pair; muscle field bisected by weak myophragm; valve margin not thickened; limbus developed rarely; encrusting; ventral valve unknown.

Synonimy
?Choniopora Von Schauroth, 1854; ?Punctopatella Grubbs, 1939; Celidocrania Liu, Zhu et Xue, 1985

Zasięg czasowy

Ordovician (Caradoc) to Lower Carboniferous; cosmopolitan.

Literatura