Gundolficeras bilobatum (Wedekind, 1908) from the mid C. marginifera Zone at Kowala and probable C. quadrantinodosa Zone at Łagów-Dule in the Holy Cros Mountains.  

Diagnoza

Narrow ventrolateral saddle, shallow dorsolateral lobe, and very deep and narrow dorsal lobe of the suture; closed umbilicus.

Porównanie

This species was included  into Falcitornoceras, referring to furrows on pyritic internal moulds, although its juvenile conch ornamentation remains unknown. Such furrows, preserved also on a juvenile conch from Łagów, are typical of several earliest Famennian tornoceratids and may just be a primitive (plesiomorphic) feature. Gundolficeras rotersi Korn, 2002 from the Platyclymenia annulata Event stratum at Kattensiepen in the Rhenish Slate Mountains does not differ from the Holy Cross Mountains material in conch form an suture. Growth lines are not preserved in my material and this precludes reliable comparison.

Autekologia

Występowanie geograficzne

Kowala; Łagów-Dule; reworked at Sieklucki’s brickpit in Kielce.

Zasięg czasowy

Mid C. marginifera Zone; probably the C. quadrantinodosa Zone (samples Ł-29, 30, and 34).  

Materiały muzealne

ZPAL: 8 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.