Diagnoza

thinly pachyconic shell with an umbilicus that is a little wider than one fourth of the conch diameter; umbilicus with shoulder is broadly rounded; the umbilical wall is oblique; densely arranged concave ribs, standing in distances of approximately 2 mm, they extend with a shallow and wide sinus across the venter; ribs produce an undulated pattern on the surface, and they are arranged in distances of three to four millimetres, are as wide as their interspaces and extend with a relatively high and wide lateral projection over the flanks to form a shallow and wide ventral sinus; sometimes, rib splitting occurs near the umbilicus.

Porównanie

The specimens from Ostrówka, although not showing sutures, are so characteristically ornamented that at least most of them belong to this typical species of the Erdbach Limestone.

Autekologia

Występowanie geograficzne

Germany (Rhenish Slate Mts.; Harz Mts.), France (Montagne Noire, Pyrenees), Spain (Sierra Morena), Ireland (Dublin County), Poland, Algeria (Sahara, Sud Oranais), Kyrgyzstan (Tian-Shan)

Zasięg czasowy

Carboniferous; Tournaisian - Visean

Materiały muzealne

Literatura

Dzik, J. 1997. Emergence and succession of Carboniferous conodont and ammonoid communities in the Polish part of the Variscan sea. Acta Palaeontologica Polonica 42, 57-170.

Holzapfel, E. 1889. Die Cephalopoden-führenden Kalke des unteren Carbon von Erdbach-Breitscheid bei Herborn. Palaeontologische Abhandlungen 5 (1): 1-74.

Korn, D. & Feist, R. 2007. Early Carboniferous ammonoid faunas and stratigraphy of the Montagne Noire (France). Fossil Record 10 (2): 99-124.

Schindewolf, O.H. 1951. Über ein neues Vorkommen unterkarbonischer Pericyclus-Schichten im Oberharz. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 93: 23-116.

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