Lateral impression of conch from borehole Słomniki IG-1 (depth 1669 m), originally described as Beyrichoceras cf. mucronatum (Phillips)

Diagnoza

Shell initially spherical, umbilicus very narrow, then thick disc-shaped, navel very narrow umbilicus); ornamentation with about 90 spiral stripes and much finer, almost straight growth lines.

Porównanie

Juveniles of the stratigraphically coeval Lusitanoceras poststriatum differ in having strong cup constrictions and an ornamentation consisting of strong growth strips. Spiral ornamentation and narrow siphuncle make the Lublin area specimen similar to the Rhenish ones.

Autekologia

Występowanie geograficzne

Germany (Rhenish Slate Mts.) and Poland (Lublin Coal Basin).

Zasięg czasowy

Carboniferous; Late Visean (suerlandense – granosus Zones)

Materiały muzealne

Literatura

Bojkowski, K. 1979. Goniatyty z karbonu Górnośląskiego i Lubelskiego Zagłębia Węglowego.  Biuletyn Instytutu Geologicznego 311: 5-68.

Korn, D. 1988. Die Goniatiten des Kulmplattenkalkes (Cephalopoda, Ammonoidea; Unterkarbon; Rheinisches Schiefergebirge). Geologie und Paläontologie in Westfalen 11: 1-293.