Fig. 112. Pseudarietites westfalicus Schmidt, 1924 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)

Fig. 112. Pseudarietites westfalicus Schmidt, 1924 from the Oberrödinghausen railway cutting. A. Specimen MB.C.31214.1 (Weyer 1993–1994 Coll.) from bed 3a. B. Cross section of specimen GPIT- PV-63982 (Vöhringer Coll.) from bed 3c. C. Growth line course of specimen GPIT-PV-63980 (Vöhringer Coll.) from bed 3b, at dm = 24.5 mm, ww = 8.2 mm, wh = 8.2 mm. D–F. Ontogenetic development of the conch width index (ww/dm), umbilical width index (uw/dm), whorl width index (ww/wh) and whorl expansion rate (WER) of selected specimens. Scale bar units= 1 mm.