Gatunek typowy
Polygnathus angusticostatus Wittekindt, 1966

Opis

Emended diagnosis.- Polygnathids with gently curved processes of S1 (lo) elements, robust platform of P1 (sp) elements, and relatively weakly reclined processes of M (ne) elements.

Remarks.- The type species belongs to one of the two main Mid Devonian branches of the polygnathids with robust platforms, the other comprising P. linguiformis. They both differ from the type lineage of Polygnathus not only in the elaborate platform of the P1 (sp) elements, but also in a more robust morphology of the M (ne) elements and a less angular appearance of the S1 (lo) elements. 

Synonimy

Zasięg czasowy

Literatura

Dzik, J. 2002. Emergence and collapse of the Frasnian conodont and ammonoid communities in the Holy Cross Mountains, Poland. Acta Palaeontologica Polonica 47 (4): 565-650