Gatunek typowy
Polonoceras planum Dybczyński from the Famennian of Kielce, Holy Cross Mountains.

Opis

Diagnosis. — Acute auricles of the aperture, involute discoidal conch with small umbilicus, flat sides and more or less tabulate venter; weak ventro-lateral vaultings may develop in the septum.
Remarks. — The incipient vaultings of the septum seems to be an expression of locally delayed withdrawal of the visceral sac, attached to the shell with muscles. 

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.