Diagnoza

Wide umbilicus; flanks of the conch rounded, merge evenly into the narrow ventral side; a shallow exter furrow visible near the aperture; suture line variable  but there is always a median saddle of about 1/3 height of the external lobe present; nucleus of the last coil shows three wide, flat, double-arched constrictions.

Porównanie

The lineage, probably ancestral to Entogonites, does not appear before the late Visean, represented by N. vittiger with evolute conchs

Autekologia

Występowanie geograficzne

Poland (Lower Silesia - Sokolec, Sudetes, clasts within the Nowa wieś Formation) and Russia (Novaya Zemlia)

Zasięg czasowy

Carboniferous; Tournaisian - Visean (Goα1-Goα4); in Poland probably latest Tournaisian (clasts within the Nowa Wieś Formation)

Materiały muzealne

Literatura

Chorowska, M. & Radlicz, K. 1994. Revision of the age of the Lower Carboniferous deposits in the northern part of the Góry Bardzkie (Sudetes). Geological Quarterly 38 (2): 249-288.

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