Fig. 28 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)

Fig. 28. Kornia acia sp. nov. from Oberrödinghausen railway cutting; both Weyer 1993–1994 Coll. A. Cross section of paratype MB.C.31072 from an unknown bed. B. Growth line course of holotype MB.C.31073.1 (Weyer 1993–1994 Coll.) from bed 5a2, at dm= 11.1 mm, ww = 11.6 mm, wh = 5.3 mm. C–E. 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.