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Fig. 2 in Virtual 3D modeling of the ammonoid conch to study its hydrostatic properties
Fig. 2. Semi-landmarks in π/6 rad steps (30°) and the model curve of the geometry for Maorites seymourianus (CPBA 16847). The first landmark is expressed in polar coordinates (r; Θ). Abbreviations: Θ, angle; r, radius.
Fig. 5 in Virtual 3D modeling of the ammonoid conch to study its hydrostatic properties
Fig. 5. Final segment in two views showing the rectiradiate ribs and the two surfaces emulating the limits of the shell wall. The external layer in black and the internal layer in grey.
Fig. 1 in Virtual 3D modeling of the ammonoid conch to study its hydrostatic properties
Fig. 1. Kossmaticeratid ammonoid Maorites seymourianus (Kilian and Reboul, 1909) from the López de Bertodano Formation, Upper Cretaceous of Antarctica. A. CPBA 16819 (microconch), lateral (A1), ventral (A2) views, scheme of apertural view (A3). B. CPBA 16841 (macroconch) showing different preservation states between the flanks, left (B1), right (B2) views. The arrowheads indicate the beginning of the body chamber.
FIGURE 13. A-I in The intriguing shapes of the ammonoid whorl
FIGURE 13. A-I) Variation of the predicted whorl area, the whorl width index (WWI=ww/wh), and the imprint zone rate (IZR=iz/wh) considering the first three PCs measured from the virtual models presented in Figure 10. The predicted area has no spatial units. A) Predicted area for PC1 at different PC2 values. Note PC1 has a local maximum depending on the score values of PC2 and PC3. B) Predicted area for PC2 at different PC1 values. C) Predicted area for PC3 at different PC1 values. D) Predicted WWI for PC1 at different PC2 values. E) Predicted WWI for PC2 at different PC1 values. F) Predicted WWI for PC3 at different PC1 values. Note that at low PC1 values changes for the WWI are not noticeable, and only at high PC1 values the changes become significant for PC3. G) Predicted IZR for PC1 at different PC2 values. H) Predicted IZR for PC2 at different PC1 values. I) Predicted IZR for PC3 at different PC1 values.
FIGURE 12 in The intriguing shapes of the ammonoid whorl
FIGURE 12. Variation of the measured area against different response variables. A) Relationship between the area and the diameter. B) Relationship between the area and the whorl height in mm. C). Relationship between the area and centroid size (CS). D) variation of the measured area for each of the selected subtaxa.
FIGURE 11 in The intriguing shapes of the ammonoid whorl
FIGURE 11. Predicted score PC1 values for the simple additive model 1 presented in Table 2 including the centroid size (CS), and the subtaxa, as predictors. Estimates with 95% of confidence. A) Predicted values for the centroid size (CS). B) Predicted values of PC1 for the selected subtaxa.
FIGURE 5 in The intriguing shapes of the ammonoid whorl
FIGURE 5. Major subclades (order level) within Ammonoida based on sutural/septal classification through time. Occurrences of major extinction events are signalled as dashed lines, minor extinction events relevant to ammonoid diversity are illustrated as dotted lines based on Bambach et al. (2004).
FIGURE 1 in The intriguing shapes of the ammonoid whorl
FIGURE 1. Summary of the morphometric and geometric morphometric (GM) models used in this work. A) Cross-section of an ammonoid showing the standard morphometric model to study the ammonoid conch morphology presented by Korn (2010) and Klug et al. (2015). Abbreviations: ah, aperture height; dm, diameter; iz, imprint zone; wh, whorl height, ww, whorl width. B-E) Geometric morphometric model to study the whorl shape presented in Morón-Alfonso et al. (2021). B) Basic virtual model (grey area) showing the corresponding configuration based on 18 semi-landmarks. C) GM model adapted to the specimen shown in A. D) GM model applied to the whorl of an evolute specimen. E) GM model applied to the whorl profile of an involute specimen (modified from Raup 1967).
FIGURE 10 in The intriguing shapes of the ammonoid whorl
FIGURE 10. Bivariate plots illustrating the shape variation from the obtained morphospace for the first three principal components. Shadowed cells indicate the space that is occupied by the ammonoid genera.
FIGURE 3 in The intriguing shapes of the ammonoid whorl
FIGURE 3. Density plot of the ammonoid genera through time. Occurrences of major extinction events are signalled as dashed lines, minor extinction events relevant to ammonoid diversity are illustrated as dotted lines based on Bambach et al. (2004).
FIGURE 2 in The intriguing shapes of the ammonoid whorl
FIGURE 2. Workflow employed in this work. The squares identify the produced data, and the hexagons indicate the analyses and procedures.
FIGURE 8. A in The intriguing shapes of the ammonoid whorl
FIGURE 8. A) Backtransform morphospace for PC1 and PC2 showing the variations on the semilandmark configurations. B) Bivariate plots for the predicted configurations obtained from A for PC3score = 0.
FIGURE 6 in The intriguing shapes of the ammonoid whorl
FIGURE 6. Boxplots for the first three principal components for the subtaxa used in this work. A) Subtaxa against PC1. B) Subtaxa against PC2. C) Subtaxa against PC3.
FIGURE 38. Baculites from the Tepeyac section. A–B, G–H in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico
FIGURE 38. Baculites from the Tepeyac section. A–B, G–H: Baculites taylorensis, A–B: CPC–2198, bed TPY64; G–H: CPC–2199 before extraction from bed TPY77; C–F, I–L: Baculites haresi, C–F: CPC–2607, bed TPY52; I–L: CPC2606, bed TPY77. Scale: 50 mm.
FIGURE 30 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico
FIGURE 30. Pachydiscus (Pachydiscus) duelmensis (Schlüter, 1972) from the Tepeyac section. A: CPC–2545, imprint of inner whorl. B–E: CPC–2197, bed TPY76. Scale: 50 mm.
FIGURE 21 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico
FIGURE 21. Menabites (Bererella) walnutensis (Young, 1963) from bed TPY77. A–C: CPC–2394 from bed TPY73; D– F: CPC–2419 from bed TPY77. CPC– 2582 from bed TPY77. Scale: 50 mm.
FIGURE 26 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico
FIGURE 26. Pseudoschloenbachia (P.) mexicana (Renz, 1936) from the Jiménez region. A–C: CPC–2351. Scale: 50 mm.
FIGURE 18 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico
FIGURE 18. Compressed Menabites (Delawarella) from the Tepeyac section. A–B: Menabites (Delawarella) vandaliense (Young, 1963), CPC–2576 from bed TPY77. Menabites (Delawarella) uddeni (Young, 1963) C–D: CPC– 2399, E–H: CPC–2400, both from bed TPY74; I–J: CPC–2416, K–N: CPC– 2415, both from bed TPY77. Scale: 50 mm.
FIGURE 15 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico
FIGURE 15. Menabites (Delawarella) n. sp. from the upper Tepeyac section. A–C: CPC– 2393, TPY73. D–F: CPC– 2560, TPY74. Scale: 50 mm.
FIGURE 11 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico
FIGURE 11. Menabites (Delawarella) delawarensis (Morton, 1830) from bed TPY35 of the Tepeyac section. A–D: CPC-2382. Scale: 50 mm.
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