Opis

Diagnosis. — Gently sinuous suture complicating ventrally in the course of evolution. Tendency to develop wide siphuncle and long septal necks reaching the preceding septum.

Remarks. — It is suggested here that families of the Devonian ammonoids represent clades in which gradual complication of septum geometry proceeds from the beginning of their emergence. In the case of the Biloclymenia clade, its evolution started from development of a wide ventral lobe. Therefore Pachyclymeniidae Korn, 1992 are included in the family. Both genera share also the higly unusual structure of siphuncle analogous to that in Aturia.

Synonimy

Zasięg czasowy

Literatura

Dzik, J. 2006. The Famennian "Golden Age" of conodonts and ammonoids in the Polish part of the Variscan sea. Palaeontologia Polonica 63, 1-359.