Sphaeroceratidae BUCKMAN, 1920


Fauna

Lytoceratidae

Pairs

Pseudoperisphinctidae

Parkinsoniidae

Clydoniceratidae

Morphoceratidae

Phlycticeratidae

Sphaeroceratidae

Oppeliidae

Lissoceratidae

Phylloceratidae

Family Sphaeroceratidae

Sphaeroceratidae especially evolved during Bajocian with species like Sphaeroceras, Chondroceras, Labyrinthoceras... One can as well meet them in Europe as on the American continent, in North Africa and Asia.

Cadomites and Polyplectites count among the rare forms which appear in the bathonian deposits of the area of Nevers. In general, this group is relatively heterogeneous, having like only common features a shell more or less involute, a fine costulation and complex sutures.

Genus Cadomites

Sphaerocones looking like Stephanoceratidae : more or less involute with deep umbilic, rounded section, collared and lipped aperture. The ribbing is bi- or polyfurcated with tubercles at the furcation points.

C. (Polyplectites) linguiferus (d'Orb.) m Ø 23 mm & C. (Cadomites) rectelobatus (v; Hau.) M Ø 44 mm

Subgenus Polyplectites

Subgenus Polyplectites (m) is probably the microconch of Cadomites. Its aperture has fine small lappets.