P. sandbergeri (Foord & Crick, 1897) from the K. crepida Zone at Jabłonna in the Holy Cross Mountains.

Diagnoza

Auricles of the aperture with relatively blunt, parabolic profile.

Porównanie

The complex nomenclatorial history of the species was clarified by Becker  who classified it as Truyolsoceras sandbergeri. It seems that it represents an early part of the P. planum lineage and I find such generic distinction redundant. Perhaps Gomi-monomeroceras (Tornoceras) dorsoplanum avaricatum Sobolew, 1914 from the Lower Łagów Beds represent this species, although its somewhat wider umbo may suggest affinities to the Protornoceras lineage.

Autekologia

Występowanie geograficzne

Jabłonna.

Zasięg czasowy

Early K. crepida Zone (bed 6). 

Materiały muzealne

ZPAL: 2 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.