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Fig. 90 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 90. Gattenpleura concava (Vöhringer, 1960) from the Oberrödinghausen railway cutting. A. Cross section of paratype GPIT-PV-63920 from bed 2. B. Suture line of paratype GPIT-PV-63920 from bed 2, at dm = 14.5 mm, ww = 7.5 mm, wh = 6.6 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). Scale bar units = 1 mm.
Fig. 89 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 89. Gattenpleura concava (Vöhringer, 1960), holotype GPIT-PV-63926 Vöhringer Coll.) from the Oberrödinghausen railway cutting, bed 4. Scale bar units = 1 mm.
Fig. 79 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 79. Gattendorfia immodica sp. nov. from the Oberrödinghausen railway cutting; photographs and dorsal view reconstruction of holotype MB.C.31165 (Weyer 1993–1994 Coll.) from bed 5a2. Scale bar units = 1 mm.
Fig. 86 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 86. Zadelsdorfia oblita sp. nov. from the Oberrödinghausen railway cutting; photographs and dorsal view reconstruction of holotype MB.C.31174.1 (Vöhringer Coll.) from bed 1. Scale bar units = 1 mm.
Fig. 65 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 65. Imitoceras initium sp. nov., holotype MB.C.31144 (Korn 1977 Coll.) from the forestry road cutting west of the Oberrödinghausen railway cutting. A. Lateral and dorsal view. B. Suture line, at ww = 14.0 mm, wh = 15.4 mm. Scale bar units = 1 mm.
Fig. 56 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 56. Costimitoceras ornatum Vöhringer, 1960 from the Oberrödinghausen railway cutting. A. Cross section of paratype GPIT-PV-63922 from bed 3e. B. Suture line of holotype GPIT-PV-63918 from bed 3e, at ww = 7.7 mm, wh = 8.5 mm. C. Growth line course of paratype GPIT-PV-63920 from bed 3d, at dm = 10.5 mm, ww = 5.5 mm, wh = 5.5 mm. D. Growth line course of holotype GPIT-PV-63918 from bed 3e, at dm = 28.0 mm, ww = 11.5 mm, wh = 15.5 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.
Fig. 55 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 55. Costimitoceras ornatum Vöhringer, 1960 from the Oberrödinghausen railway cutting, both Vöhringer Coll. A. Holotype GPIT-PV-63918 from bed 3e. B. Paratype GPIT-PV-63920 from bed 3d. Scale bar units = 1 mm.
Fig. 45 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 45. Stockumites voehringeri sp. nov. from the Oberrödinghausen railway cutting. A. Cross section of paratype MB.C.31099.1 (Vöhringer Coll.) from bed 4. B. Cross section of paratype MB.C.31112.1 (Weyer 1993–1994 Coll.) from bed 3e. Scale bar units = 1 mm.
Fig. 52 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 52. Acutimitoceras ucatum sp. nov. from the Oberrödinghausen railway cutting, both Vöhringer Coll. A. Paratype GPIT-PV-63899 from bed 5. B. Holotype GPIT-PV-63900 from bed 6. Scale bar units = 1 mm.
Fig. 44 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 44. Stockumites voehringeri sp. nov. from the Oberrödinghausen railway cutting. A. Cross section of paratype MB.C.31111.2 (Weyer 1993–1994 Coll.) from bed 3d2. B. Suture line of paratype MB.C.31111.3 (Weyer 1993–1994 Coll.) from bed 3d2, at dm = 20.0 mm, ww = 13.1 mm, wh = 12.6 mm. C. Suture line of paratype GPIT-PV-63885 (Vöhringer Coll.) from bed 3b, at ww = 20.5 mm, wh = 17.5 mm. D. Course of the internal shell thickenings of paratype GPIT-PV-63850 (Vöhringer Coll.) from bed 3e, at dm = 34.0 mm, ww = 17.0 mm, wh = 21.5 mm. E. Course of the internal shell thickenings of holotype GPIT-PV-63995 (Vöhringer Coll.) from unknown bed of Oberrödinghausen, at dm = 40.0 mm, ww = 20.5 mm, wh = 22.0 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.
Fig. 15 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 15. Mimimitoceras perditum sp. nov. from the Oberrödinghausen railway cutting, all Vöhringer Coll. A. Cross section of specimen MB.C.31051.1 from bed 2. B. Cross section of specimen GPIT- PV-63862 from bed 5. C. Cross section of specimen MB.C.31053 from bed 2. Scale bar units = 1 mm.
Fig. 36 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 36. Stockumites procedens (Korn, 1984). A. Specimen MB.C.31088 (Weyer 1993–1994 Coll.) from the Oberrödinghausen railway cutting, bed 6b. B. Cross section of paratype GZG.INV.132 (Korn 1980 Coll.) from the Hangenberg Limestone at Müssenberg(from Korn 1984). 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 specimens from the type locality Stockum and from Oberrödinghausen. Scale bar units = 1 mm.
Fig. 10 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 10. Early Tournaisian representative ammonoids from the Oese section, all Weyer & Korn 2000 Coll. A. Paragattendorfia sp., specimen MB.C.5262.8 from bed 22. B. Stockumites sp., specimen MB.C.5262.9 from bed 22. C. Gattenpleura concava (Vöhringer, 1960), specimen MB.C.5260.1 from bed 28. D. Weyerella molaris (Vöhringer, 1960), specimen MB.C.5260.2 from bed 28. E. Kazakhstania evoluta (Vöhringer, 1960), specimen MB.C.5258.1 from bed 30. F. Paprothites dorsoplanus (Schmidt, 1924), specimen MB.C.5262.1 from bed 22. Scale bar units = 1 mm.
Fig. 9 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 9. The lithological succession of the Hangenberg Limestone in the Oese section with the occurrence of the ammonoid species.
Fig. 6 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 6. The lithological succession of the Hangenberg Limestone in the Hasselbachtal section with the occurrence of the ammonoid species.
Fig. 31 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 31. Stockumites intermedius (Schindewolf, 1923) from the Oberrödinghausen railway cutting, bed 5. A. Specimen GPIT-PV-63993 (Vöhringer Coll.). B. Specimen GPIT-PV-64015 (Vöhringer Coll.). Scale bar units = 1 mm.
Fig. 26 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 26. Kornia fibula sp. nov. A. Cross section of paratype MB.C.31069.1 (Weyer 1993–1994 Coll.) from Oberrödinghausen, bed 2a. B. Growth line course of holotype MB.C.5260.3 (Weyer 1993–1994 Coll.) from Oese, bed 28, at dm = 9.8 mm, ww = 9.9 mm, wh = 4.8 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.
Fig. 25 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 25. Kornia fibula sp. nov. A. Paratype MB.C.31069.2 (Weyer 1993–1994 Coll.) from Oberrödinghausen, bed 2a. B. Holotype MB.C.5260.3 (Weyer 1993–1994 Coll.) from Oese, bed 28. Scale bar units = 1 mm.
Fig. 3. Reconstructions and a in The origin of ammonoid locomotion
Fig. 3. Reconstructions and a simplified cladogram of one bactritid and nine primitive ammonoids from Early and Middle Devonian (from left to right: Lobobactrites, Cyrtobactrites, Kokenia, Metabactrites, Anetoceras, Erbenoceras, Chebbites, Talenticeras, Mimagoniatites, Agoniatites). Note the change in the orientation of the aperture and the increase of soft body volume in relation to the conch diameter. The morphology of the soft body is largely speculative. The number and proportion of arms, however, is here supposed to have been similar to coleoids, because of similarities in embryonic shell, radula and beak morphology between ammonoids and coleoids (Landman et al. 1997; Tanabe and Fukuda 1999). Additionally, the presence of a hood as in Recent Nautilus is presumed based on the absence of jaw apparatuses in early ammonoids which were suitable as a lid for the aperture. In the cladogram (modified after Korn 2001, see this article also for the character matrix) with the most important evolutionary steps among Devonian ammonoids, those taxa not discussed in detail are marked with an asterisk.
Fig. 4 in The origin of ammonoid locomotion
Fig. 4. Transformations in conch morphology of eight primitive ammonoids from the Early and Middle Devonian (from bottom to top: Kokenia, Metabactrites, Anetoceras, Erbenoceras, Chebbites, Talenticeras, Mimagoniatites, Agoniatites). Subdivision of the coiling modes is slightly arbitrary, especially the differentiation between the crioconic and the cyrtoconic state. In that case, it was the intention to clarify the changes in coiling and not to quantify the curvature. Consequently, this imprecision appeared justifiable. In the left column, the body chamber length (BCL) is given at the top right, the angle of the orientation of the aperture (OA) at the bottom left and a code for the coiling mode (ontogeny) at the bottom right. The second column displays the complete conchs with the colour code for the coiling modes (white—cyrtoconic, subtle curvature; light grey—crioconic, distinctly curved, but whorls not in contact; medium grey—advolute, whorls close or touching; dark grey—evolute, whorls slightly overlapping). Columns three to six show the isolated conch parts sorted according to the coiling mode.
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