Fig. 38 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)

Fig. 38. Stockumites undulatus (Vöhringer, 1960) from the Oberrödinghausen railway cutting. A. Specimen MB.C.31091 (Weyer 1993–1994 Coll.) from bed 6a. B. Cross section of paratype GPIT- PV-63881 (Vöhringer Coll.) from bed 6. C. Suture line of paratype GPIT-PV-63879 (Vöhringer Coll.) from bed 6, at ww = 8.5 mm, wh = 7.6 mm. D. Growth line course of paratype GPIT-PV-63881 (Vöhringer Coll.) from bed 5, at dm = 9.5 mm, ww = 6.0 mm, wh = 5.5 mm. E. Growth line course of holotype GPIT- PV-63877 (Vöhringer Coll.) from bed 5, at dm = 16.3 mm, ww = 9.2 mm, wh = 9.0 mm. F –H. 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.