Cheiloceras praecursor (Frech, 1902) from the late K. crepida or early C. quadrantinodosa Zone at Kadzielnia in the Holy Cross Mountains.

Diagnoza

Suture with acutely pointed, deep flank lobe and rounded ventrolateral saddle; medium-size thick discoidal conch with rare internal thickenings following the course of aperture.

Porównanie

From the geologically younger Ch. lagoviense the species differs in a more robust conch appearance and the shape of ventrolateral saddle of the suture. The two juvenile specimens differ in prominence of the ventrolateral saddle. The suture of the neotype proposed by him is close to that shown by the specimen from Kadzielnia.

From the earliest species of Dimeroceras the species differs in the narrow juvenile umbilicus of about 1 mm width and the weak periumbonal lobe.

Autekologia

Występowanie geograficzne

K. crepida or C. quadrantinodosa Zone. Kadzielnia. .

Zasięg czasowy

Late K. crepida or C. quadrantinodosa Zone.

Materiały muzealne

ZPAL: 6 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.