Diagnoza

The transverse striae are radial over the flanks and bend forward at the shoulder and then back to form a deep ventral sinus; fine spiral lirae are also present, close together over the venter and further apart over the flanks; they do not appear to extend quite as far as the umbilical edge and become more feeble with increasing size, constrictions are present, their course following that of the transverse striae.

Porównanie

Resembles G. complicatum (de Koninck) that is stouter and has a smaller umbilicus. It closely resembles G. meslerianum (Girty) and appears to be the species from which it evolved

Autekologia

Występowanie geograficzne

Great Britain (Yorkshire, Lancashire) and Poland (Kielce Syncline)

Zasięg czasowy

Carboniferous; Visean - Serpukhovian

Materiały muzealne

Literatura

Moore, E.W.J. 1946. The Carboniferous goniatite genera Girtyoceras and Eumorphoceras. Proceedings of the Yorkshire Geological Society 25: 387-445.

Żakowa, H. 1992. Goniatites from the Upper Visean (Kielce Syncline, the Holy Cross Mts, Poland). Geological Quarterly 36 (3): 327-344.