Polonoceras planum Dybczyński, 1913 from the mid C. marginifera Zone at Kowalain the Holy Cross Mountains.

Diagnoza

Distinctly tabulate venter even in juvenile specimens, narrow umbilicus.

Porównanie

Tips of auricles are located somewhat dorsally to the tabulate venter, where they sometimes leave a shallow furrow on the phragmocone internal mould. In this respect the species is different from P. dorsoplanum, its probable successor.

Autekologia

Występowanie geograficzne

Kowala; reworked at Sieklucki’s brickpit in Kielce. 

Zasięg czasowy

Mid C. marginifera Zone. 

Materiały muzealne

ZPAL: 12 specimens.

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.