Fig. 23. Paragattendorfia sphaeroides Weyer, 1972 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)

Fig. 23. Paragattendorfia sphaeroides Weyer, 1972 from the Oberrödinghausen railway cutting. A. Cross section of paratype GPIT-PV-63937 from bed 2. B. Cross section of paratype GPIT-PV-63935 from bed 2. C. Suture line of paratype GPIT-PV-63935 from bed 2, at ww = 13.2 mm, wh = 6.0 mm. D. Growth line course of holotype GPIT-PV-63909 from bed 3c, at dm = 22.0 mm, ww = 17.5 mm, wh = 11.5 mm. E –G. 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.