Fig. 53 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)

Fig. 53. Acutimitoceras ucatum sp. nov. from the Oberrödinghausen railway cutting. A. Cross section of paratype GPIT-PV-63902 from bed 6. B. Suture line of paratype GPIT-PV-63899 from bed 5, at ww = 7.2 mm, wh = 8.5 mm. C. Growth line course of holotype GPIT-PV-63900 from bed 6, at ww = 7.3 mm, wh = 8.8 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.