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FIGURE 36 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico

FIGURE 36. Amapondella amapondense (van Hoepen, 1921) from bed TPY50 of the Tepeyac section. A–C: CPC– 2345, D–E: CPC–2346. Scale: 50 mm.

FIGURE 35 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico

FIGURE 35. Glyptoxoceras texanum Kennedy, Landman and Cobban, 2001 from the Tepeyac section. A–D: CPC– 2349, bed TPY48–50; E–F: CPC–2610, bed TPY73. Scale: 50 mm.

FIGURE 39 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico

FIGURE 39. Scaphites (S.) hippocrepis III from bed TPY73 of the Tepeyac section. A–D, I–L: CPC–2599; E–H, M–P: CPC–1600, both from bed TPY72. Scale: 50 mm.

FIGURE 31 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico

FIGURE 31. Morphometry of lower Campanian Menuites and Pachydiscus. A: WB/WH and U/D against D for Pachydiscus (P.) duelmensis from Tepeyac (red) and Germany (green), the holotype of Pachydiscus jimenezi Renz, 1936 (turquoise) and Pachydiscus paulsoni of Young (1963, grey) and Cobban and Kennedy (1992b, blue). B: WB/WH and U/D against D for Menuites stephensoni from Tepeyac (red) and western Coahuila (Ifrim et al., 2013, black). Morphometric data of Young (1963) are implausible and thus not shown.

FIGURE 19 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico

FIGURE 19. Menabites (Bererella) walnutensis (Young, 1963) from beds TPY54 to TPY60. A–B: CPC–2392, TPY54- 56. C–D: CPC–2581, TPY60. E–G: CPC– 2549, TPY69top. Scale: 50 mm.

FIGURE 1. A in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico

FIGURE 1. A: Map of Mexico with the state of Coahuila marked. B: Geological map of the Jimenez area (redrawn from Servicio Geológico de México, 2008). The Tepeyac locality is marked by an asterisk.

FIGURE 9 in Geometric morphometrics in ammonoids based on virtual modelling

FIGURE 9. Morphospace formed by PC1 and PC3 from this study showing the location for each specimen in Table 3. The virtual whorl cross-sections for extreme values are illustrated below the axis of each PC.

FIGURE 8 in Geometric morphometrics in ammonoids based on virtual modelling

FIGURE 8. Morphospace formed by the first two PCs found in this study showing the location for each specimen in Table 3. The virtual whorl cross-sections of the PC-score values are illustrated below the axis. Combinations of these PC values are shown in the extremes of the morphospace. Evolute ammonoids are confined to a region to the left, this could be caused by a lack of subevolute specimens in the original sample.

FIGURE 7 in Geometric morphometrics in ammonoids based on virtual modelling

FIGURE 7. Transformations from negative to positive values in PC3. A) Semilandmark configuration at PC3=-0.3 showing the x (red) and y (blue) vectorial components towards PC3 positive values. B) Semilandmark configuration at PC3=0.3 obtained from the transformation in A. C). Translations for each semilandmark in the x-axis for PC3. Empty bars illustrate the closest covariation pattern from Figure 4; in this case, there is a weak adjustment to a compression of the whorl cross-section. D) Translations for each semilandmark in the y-axis for PC2. Empty bars illustrate the closest covariation pattern from Figure 4; in this case, a weak adjustment to a compression of the whorl cross-section. Note that most of the variation is in semilandmarks 3, 6, 12, and 15 that define the vertical location of the whorl width with respect to the whorl cross-section.

FIGURE 6 in Geometric morphometrics in ammonoids based on virtual modelling

FIGURE 6. Transformations from negative to positive values in PC2. A) Semilandmark configuration at PC2=-0.3 showing the x (red) and y (blue) vectorial components towards PC2 positive values. B) Semilandmark configuration at PC2=0.3 obtained from the transformation in A. C). Translations for each semilandmark in the x-axis for PC2. Empty bars illustrate the closest covariation pattern from Figure 4; in this case, a localized compression in the peripheric landmarks (2 to 4 and 11 to 13). D) Translations for each semilandmark in the y-axis for PC2. Empty bars illustrate the closest covariation pattern from Figure 4; in this case, an elongation with an increase in the involution degree of the whorl cross-section.

opencc-by-4.0Dec 2020View details →

FIGURE 2 in Computational fluid dynamics modeling of fossil ammonoid shells

FIGURE 2. All of the shells employed in this study plotted in Westermann morphospace. The 3D models used for each member are shown to the right of the name/designation in the legend. Cardioceras, Oppelia, and Sphenodiscus are based on the shells employed in Jacobs (1992), Nautilus pompelius was created using laser scans and scaled to two different sizes (life-size [approx. 14.5 cm] and 5 cm diameter), and all other shells were created to match basic Westermann morphotypes (Westermann, 1996; Ritterbush and Bottjer, 2012).

opencc-by-4.0Aug 2019View details →

Fig. 7 in The gaudryceratid ammonoids from the Upper Cretaceous of the James Ross Basin, Antarctica

Fig. 7. Macroconchs of the gaudryceratid ammonoid Anagaudryceras calabozoi Raffi and Olivero sp. nov., from early Campanian (Cretaceous), Antarctica, Rabot Formation, Redonda Point locality (A) and Hamilton Norte locality (B, C). A. CADIC PI 411, holotype, phragmocone and part of the body chamber in lateral (A1) and ventral (A2) views. B. CADIC PI 456, phragmocone and part of the body chamber in lateral view. C. CADIC PI 464, phragmocone and part of the body chamber in lateral view. Arrows mark the beginning of the body chamber.

opencc-zeroJan 2024View details →

Linked collectors and determiners for: The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran).

Natural history specimen data linked to collectors and determiners held within, "The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/453c885c-f427-4a38-ab97-dc14b686e126">https://bionomia.net/dataset/453c885c-f427-4a38-ab97-dc14b686e126</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/453c885c-f427-4a38-ab97-dc14b686e126">https://gbif.org/dataset/453c885c-f427-4a38-ab97-dc14b686e126</a>. Formatted as a Frictionless Data package.

opencc-zeroJan 2024View details →

Linked collectors and determiners for: The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea).

Natural history specimen data linked to collectors and determiners held within, "The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/d4ff05b4-fdac-44e8-8c2e-0733a93169a0">https://bionomia.net/dataset/d4ff05b4-fdac-44e8-8c2e-0733a93169a0</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/d4ff05b4-fdac-44e8-8c2e-0733a93169a0">https://gbif.org/dataset/d4ff05b4-fdac-44e8-8c2e-0733a93169a0</a>. Formatted as a Frictionless Data package.

Fig. 53. Triainoceratidae from the Red Ironstone Formation, all reproduced from d in The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

Fig. 53. Triainoceratidae from the Red Ironstone Formation, all reproduced from d'Archiac & de Verneuil (1842). A. Sandbergeroceras costatum (d'Archiac & de Verneuil, 1842). B. Sandbergeroceras incertum (d'Archiac & de Verneuil, 1842). C. Sandbergeroceras tuberculosum (d'Archiac & de Verneuil, 1842). Scale bar units = 1 mm.

Fig. 39 in The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

Fig. 39. Lunupharciceras kochi sp. nov. A. Holotype MB.C.3627 (Koch Coll.) from Langenaubach (Constanze Mine). B. Paratype MB.C.22186 (Stein Coll.) from Langenaubach (Constanze Mine). C. Paratype MB.C.3628 (Koch Coll.) from Oberscheld (Anna Mine). D. Paratype MB.C.22177 (Kauth Coll.) from Dillenburg. E. Paratype MB.C.22181 (Lotz 1902 Coll.) from Oberscheld (Prinzkessel Mine). Scale bar units = 1 mm.

Fig. 26. Pharciceras galeatum Wedekind, 1918. A in The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

Fig. 26. Pharciceras galeatum Wedekind, 1918. A. Specimen MB.C.22182 (Koch Coll.) from Oberscheld (Anna Mine). B. Specimen MB.C.22180 (Kegel 1927 Coll.) from Oberscheld (Sahlgrund Mine). Scale bar units = 1 mm.

Fig. 19. Pharciceras kayseri Wedekind, 1918. A in The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

Fig. 19. Pharciceras kayseri Wedekind, 1918. A. Suture line of specimen MB.C.30235.1, probably from Oberscheld, at ww = 18.0 mm, wh = 20.0 mm. B–E. Ontogeneric trajectories of the cardinal conch parameters. Abbreviations: see Material and methods. Scale bar units = 1 mm.

Fig. 16 in The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

Fig. 16. Pharciceras tridens (Sandberger & Sandberger, 1850). A. Suture line of specimen MB.C.3618 (Ahlburg Coll.) from Oberscheld (Königszug Mine), at dm = 48.5 mm, ww = 19.0 mm, wh = 18.0 mm. B–E. Ontogeneric trajectories of the cardinal conch parameters. Abbreviations: see Material and methods. Scale bar units = 1 mm.

Fig. 44 in The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

Fig. 44. Synpharciceras clavilobum (Sandberger & Sandberger, 1850). A. Specimen MB.C.3653 (Lotz 1901 Coll.) from Oberscheld (Gründchesseite Mine). B. Specimen MB.C.22191 (Koch Coll.) from Oberscheld (Anna Mine). Scale bar units = 1 mm.