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11 results for “Angulithes”
Fig. 12 in Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid
Fig. 12. Comparison of whorl sections, position of siphuncles, sutural sinuosity, and septal spacing of Angulithes mermeti (Coquand, 1862) (A) and a specimen illustrated as Nautilus pompilius Linnaeus, 1758 in the Treatise (Kummel 1964: fig. 329) (B). A. AFK 225 from the upper Cenomanian of Egypt in lateral (A1) and apertural (A2) views; external suture (A3). B. Specimen from Tagnan (Philippines) at D = 130 mm from the SW Pacific (drawn from an artificial internal mould) (B1, B2); suture line (B3) (modified from Wani et al. 2008).
Fig. 11 in Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid
Fig. 11. Geochronology (Ogg and Hinnov 2012), ammonite biostratigraphy (Wright and Kennedy 2017) and sequence stratigraphy (Robaszynski et al. 1998; Wilmsen 2003) of the Cenomanian Stage plotted against evolutionary trends in the hercoglossid nautiloid genus Angulithes. See text for further explanations.
Fig. 2 in Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid
Fig. 2. Shell parameters, suture terminology, and biometric factors of the planispiral nautiloid shell (modified after Wilmsen 2016). Abbreviations: Dmax, maximum diameter; U, umbilical width at Dmax; Wb, whorl breadth at Dmax; Wh, whorl height at Dmax.
Fig. 9 in Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid
Fig. 9. Reconstruction of the life position of the hercoglossid nautilid Angulithes mermeti (Coquand, 1862) in sagittal cross-section (A1) and apertural view (A2) (approximately 1/2 of natural size).
Fig. 6 in Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid
Fig. 6. Shell form (A1–C1), external sutures (A2–C2), and whorl cross-section (D) of selected hercoglossid nautiloids. A. Nautilus mermeti (Coquand, 1862) from the Cenomanian of Ténoukla near Tébassa, northeast Algeria (after Coquand 1862: pl. 2: 1, 2). B. Nautilus munieri Choffat, 1886 from the upper Cenomanian of Villa Nova d'Ourem, Portugal (after Choffat 1886: pl. 2: 1). C. Angulithes triangularis Montfort, 1808 (MB.C.2052) from the lower Sardinero Formation, lower Middle Cenomanian of Langre, Cantabria, northern Spain (after Wilmsen 2000: pl. 1: 2b, pl. 5: 15). D. Nautilus triangularis Montfort, 1808 from the Cenomanian of Île de Madame, Charente-Maritime, France (after d'Orbigny 1840: pl. 12: 2).
Fig. 4 in Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid
Fig. 4. Hercoglossid nautiloid Angulithes mermeti (Coquand, 1862) from the Cenomanian of Wadi Ghonima, Egypt. A. AFK 202 in lateral (A1, A3) and ventral (A2) views. B. AFK 218 in lateral (B1) and apertural (B2) views; arrow shows the position of the siphuncle.
Fig. 3 in Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid
Fig. 3. Hercoglossid nautiloid Angulithes mermeti (Coquand, 1862), AFK 225 from the Cenomanian of Wadi Ghonima, Egypt, in apertural (A1) and lateral (A2) views.
Fig. 8 in Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid
Fig. 8. Westermann morphospace diagram, simplified and modified after Ritterbush et al. (2014), with placement of the hercoglossid nautiloid Angulithes mermeti (Coquand, 1862) (see Table 2 for raw data; black circle indicates mean value); for comparison, two specimens of Nautilus pompilius Linnaeus, 1758 are plotted in the diagram, too (1, specimen 17 of Tajika et al. 2015; 2, an early Pleistocene specimen from Wani et al. 2008).Abbreviations: Th, shell inflation; U, umbilical exposure; w, whorl expansion.
Fig. 5 in Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid
Fig. 5. Cross-sections and external sutures of the hercoglossid nautiloid Angulithes mermeti (Coquand, 1862) from the Cenomanian of Wadi Ghonima, Egypt. A. AFK 225, shell shape in apertural view (A1), external sutures (A2); grey shading indicates position of the umbilical saddle. B. AFK 202, shell shape in ventral view. C. AFK 218, whorl shape, showing the position of the siphuncle.
Fig. 10 in Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid
Fig. 10. Palaeoecology of the hercoglossid nautiloid Angulithes mermeti (Coquand, 1862). A. Reconstruction of A. mermeti (Coquand, 1862) in the lagoonal shallow-water environment of the Galala Formation (background after a subaqueous photograph in the property of MW from a lagoonal site in the present-day Red Sea near Hughhada taken in 1999, treated by greyscale-filtering in Photoshop CS2); rudist illustrations from Mitchell (2002). B. Bioclastic rudist (r) floatstone, the lagoonal host sediment in which A. mermeti has been found in the Wadi Ghonima section (thin-section photomicrograph of sample 080217-18). C. Close-up of Fig. 9B showing the bioclastic packstone matrix in detail, including numerous fragments of dasycladalean algae (gr).
Fig. 7 in Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid
Fig. 7. Palaeobiogeographical distribution of the hercoglossid nautiloid Angulithes mermeti (Coquand, 1862). Cenomanian palaeogeographical and plate tectonic situation modified after Barrier and Vrielynck (2008); nautiloid occurrences are indicated by asterisks (see text for literature sources). Abbreviations: APB, Anglo-Paris Basin; MEI, Mid-European Island,
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