Diagnoza

Shell involute and discoidal with sinuous simple ornament on the flanks and venter; an edge delimites umbilicus is raised and decorated with spiral ridges in the middle stages of growth with simultaneous narrowing of the umbilicus

Porównanie

The ornamentation on the umbilical shoulder takes form of a Homoceras crenulata spiral ridge.

Autekologia

Występowanie geograficzne

Portugal, Ireland (Clare Co), Great Britain (Derbyshire, Lancashire and Yorkshire in England; Pen-y-cae and Barland Comon in Wales), France (Nord-Pas-de-Calais), Belgium (Hainaut, Liège), Germany (Rhenish Slate Mts.) and Poland (Lublin Coal Basin), Uzbekistan, Morocco (Tafilalt) and Algeria (Atlas)

Zasięg czasowy

Carboniferous; Bashkirian (H2c - R1a4)

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

Korejwo, K. 1969. Stratigraphy and palaeogeography of the Namurian in the Polish Lowland. Acta Geologica Polonica 19 (4): 609-70.

Korejwo, K. 1986. Biostratigraphy of the Carboniferous deposits of the Świdnik blocks (Lublin Coal Basin). Acta Geologica Polonica 36 (4): 337-346.

Schmidt, H. 1934. Cephalopodenfaunen des älteren Namur aus der Umgegend von Arnsberg in Westfalen. Jahrbuch der Preußischen Geologischen Landesanstalt 54 (for 1933): 440-461.