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41 results for “Tribodus”
Fig. 38 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 38. Reconstructions of the basicranial circulation in Tribodus limae. A, ventral (external) view of the braincase showing the basicranial arterial circuit; solid lines represent vessels visible on the surface or external to the cartilage, and dashed lines represent those internal to the cartilage or endocranial space; B, dorsal cutaway (interior) view of the floor of the cranial cavity, showing the same vessels as seen from above; note the internal carotid arteries emerging from the basicranial cartilage through paired foramina in the floor of the braincase anterior to the dorsum sellae, and then diverging to form the optic artery anteriorly and the efferent pseudobranchial/ophthalmic artery posteriorly (the latter divides after exiting the braincase). Solid lines represent vessels visible on the surface of the cutaway (on the floor of the cranial cavity), and dashed lines represent vessels internal to the cartilage or ventral to the basicranium (compare with A). No scale.
Fig. 41. A in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 41. A, Composite reconstruction showing probable extent of embryonic cartilages in Tribodus limae; the postorbital process, otic capsule, and antorbital process have been cut away to show the foramina. B, Reconstruction showing probable extent of embryonic cartilages in Egertonodus basanus. Color scheme based on Maisey (2005), for easier comparison with his reconstructions of the embryonic cartilages in other elasmobranchs. No scale.
Fig. 16 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 16. Ventral view of the Tribodus limae endocast with otic labyrinth removed, anterior at top (surface rendering). No scale.
Fig. 37 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 37. Skeletal labyrinth structure in other elasmobranchs. A–C, extant Notorynchus, A, lateral; B, dorsal; C, medial views; D, Cladodoides, lateral view. After Maisey, 2005. No scale.
Fig. 13 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 13. Lateral view of the Tribodus braincase, anterior to the right (surface rendering). No scale.
Fig. 14 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 14. Medial view of the Tribodus braincase sliced through the sagittal plane, anterior to the left
Fig. 12 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 12. Anterior (A) and posterior (B) views of the Tribodus braincase (surface renderings). No scale.
Fig. 10 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 10. Dorsal view of the Tribodus limae braincase, AMNH FF 13958, anterior at top (surface rendering). No scale.
Fig. 8 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 8. Transverse CT scan slices through the Tribodus limae braincase. Otic region. A, slice 257, at the level of the hypophysis and facial nerve; B, slice 270, showing the pituitary vein canal and the anterior ramus of the octaval nerve; C, slice 285, showing the hypophyseal duct and internal carotids; D, slice 290, showing the posterior ramus of the octaval nerve and the exit of the orbital arteries from the braincase; E, slice 298, at the level of the hypophyseal foramen; F, slice 303, showing the exit of the efferent hyoidean arteries from the braincase; G, slice 307, showing the canals for the lateral dorsal aortae converging to form a single chamber medial to the efferent hyoidean foramina; H, slice 313, showing the lateral dorsal aortae diverging posteriorly. No scale.
Fig. 3 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 3. Braincase of Tribodus limae, AMNH FF 13958. A, ventral view; B, dorsal view; C, lateral view. Scale bar is 2 cm.
Fig. 6 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 6. Transverse CT scan slices of the Tribodus limae braincase, AMNH 13958. Ethmoidal region. A, slice 57, through the olfactory chamber and precerebral fontanelle; B, slice 72, through the precerebral fontanelle showing the ventral exit of the orbitonasal canal; C, slice 83, through the precerebral fontanelle showing the orbitonasal canal traveling through the cartilage; D, E, F, slices 87, 89, and 94, respectively, through the precerebral fontanelle showing the course of the profundus nerve and orbitonasal canal; G, slice 100, at the level of the anterior cerebral canal; H, slice 159, through the anterior of the orbit at the level of the trochlear nerve and median ventral basicranial process. No scale.
Fig. 9 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 9. Transverse CT scan slices through the Tribodus limae braincase. Occipital region. A, slice 334, at the level of the preampullary canals and perilymphatic foramina; B, slice 369, at the level of the posterior ampullae and glossopharyngeal canal; C, slice 395, at the level of the vagus nerve; D, slice 400, at the level where the vagus canal exits into the glossopharyngeal foramen; E, slice 418, showing canals for the occipital arteries and spino-occipital nerves; F, slice 423, at the level of the occipital cotylus. No scale.
Fig. 1 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 1. Phylogenetic relationship of hybodonts (represented here by Tribodus and Egertonodus) to other representative fossil and extant chondrichthyans. Based on Maisey (1989); Coates and Sequeira (2001); Ginter (2005); Gaudin (1991); and Young (1982).
Fig. 2 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 2. Reproduction of original illustrations of the Tribodus limae braincase, modified from Brito (1992), in A, dorsal; B, ventral, and C, lateral views. Abbreviations (translated from the original French): ald, foramina for lateral dorsal aortae; a.orb, orbital artery; cap.ot, otic capsule; c.j, jugular canal; c.occ, occipital cotylus; csca, anterior semicircular canal; csce, external semicircular canal; cscp, posterior semicircular canal; f.end, endolymphatic (parietal) fossa; f.m, foramen magnum; f.p, precerebral fontanelle; p.art, articular process for palatoquadrate; p.ot.lat, lateral otic process; ppo, postorbital process; q.int, internasal keel; V.opht, superficial ophthalmic ramus of nerve V; V + VII, foramen for main branch of trigeminal and facial nerves; VII hym, foramen for hyomandibular branch of facial nerve; IX + X, glossopharyngeal-vagus foramen. Not to scale.
Fig. 17 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 17. Anterior (A) and posterior (B) views of the Tribodus endocast with otic labyrinth removed,
Fig. 27 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 27. SEM of Tribodus limae cephalic spine, AMNH 13959. Scale bar is 1 mm.
Fig. 11 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 11. Ventral view of the Tribodus braincase, anterior at top (surface rendering). No scale.
Fig. 5 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 5. Tribodus limae, UERJ-PMB-114. A, dorsal; B, ventral views. Scale bar is 2 cm.
Fig. 4 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 4. Tribodus limae, UERJ-PMB-40. A, dorsal; B, ventral views. Scale bar is 2 cm.
Fig. 24 in Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
Fig. 24. Close-up of lateral basicranial foramina in Tribodus limae (UERJ-PMB-40). Scale bar is 1 cm.
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