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

Fig. 7. Early Tournaisian representative ammonoids of the family Prionoceratidae from the Hasselbachtal section, all Weyer 1993–1994 Coll. A. Mimimitoceras hoennense Korn, 1993, specimen MB.C.5241.2 from bed 59. B. Globimitoceras globiforme (Vöhringer, 1960), specimen MB.C.5240.7 from bed 57. C. Stockumites voehringeri sp. nov., paratype MB.C.5235.1 from bed 46. [Illustrated by Korn & Weyer (2003, pl. 1 figs 1–2) as Acutimitoceras cf. intermedium.] D. Stockumites intermedius (Schindewolf, 1923), specimen MB.C.5248.1 from bed 77. E. Stockumites convexus (Vöhringer, 1960), specimen MB.C.5241.1 from bed 59. F. Stockumites parallelus sp. nov., paratype MB.C.5247.2 from bed 57. (Illustrated by Korn & Weyer 2003: pl. 2 figs 6–7, as Acutimitoceras subbilobatum.) Scale bar units =1 mm.

Fig. 39. Stockumites convexus (Vöhringer, 1960) from the Oberrödinghausen railway cutting. A. Holotype GPIT-PV-63903 (Vöhringer Coll.) from bed 6. B. Paratype GPIT-PV-63905 (Vöhringer Coll.) from bed 5. C. Paratype GPIT-PV-63904 (Vöhringer Coll.) from bed 5. D. Specimen MB.C.31096 (Weyer 1993–1994 Coll.) from bed 6b2. Scale bar units =1 mm.

Fig. 40. Stockumites convexus (Vöhringer, 1960) from the Oberrödinghausen railway cutting; all Vöhringer Coll. A. Cross section of paratype GPIT-PV-63906 from bed 6. B. Cross section of specimen MB.C.31094.1 from bed 6. C. Cross section of specimen MB.C.31094.2 from bed 6. D. Cross section of specimen MB.C.31093.1 from bed 5. E. Cross section of specimen MB.C.31092 from bed 4. F. Cross section of specimen MB.C.31094.3 from bed 6. G. Suture line of paratype GPIT-PV-63904 from bed 5, at ww =7.5 mm, wh=7.0 mm. H. Growth line course of holotype GPIT-PV-63903 from bed 6, at dm =16.0 mm, ww ca. 9.0 mm, wh =8.5 mm. I–K. 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.