Diagnoza

disc-shaped shell with narrow umbilicus; ornamented with about 10 constrictions, which run biconvexly with a strong ventrolateral projection; external side is not yet sharpened at 24 mm diameter.

Porównanie

Most of the Girtyoceras species have a much wider shell than G. brueningianum; G. kazakhorum has a very similar ornamentation, but is broader and narrower umbilicated and develops a keel earlier; G. luscinia, G. meslerianum and G. premeslerianum have a considerably thicker conchs; G. goii and G. margaritatum  have a keeled external side at an early stage; G. platytorme, G. moorei and G. edwinae are more widely umbilicated.

Autekologia

Występowanie geograficzne

Germany (Rhenish Slate Mts.), Czechia (Nízký Jeseník, Drahanská vrchovina ), Poland, Russia (Komi, Betyu River in Urals), England (Lancashire)

Zasięg czasowy

Carboniferous; Visean 

Materiały muzealne

25 specimens from Czechia.

Literatura

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

Schmidt, H. 1925. Die carbonischen Goniatiten Deutschlands. Jahrbuch der Preußischen Geologischen Landesanstalt 45 (for 1924): 489-609.