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10 results for “Gyrodus”
Figure 6 in Paleohistological studies of bone and teeth in Gyrodus circularis (Gyrodidae: Pycnodontiformes: Actinopterygii). Phylogenetic implications for the Gyrodidae
Figure 6. – Gyrodus circularis. Ground transversal sections (transmitted natural light). A: (MNHN-F-Histos 2748) A view of the contact between the tooth and the alveolar bone (ab). The alveolar spongy bone is constituted of relatively thin bony trabeculae that surround numerous vascular cavities. (od = orthodentine). B: (MNHN-F-Histos 2748) Detail showing the contact between the orthodentine (od) and the alveolar bone (ab). Some vascular cavities (arrowheads) and numerous osteocytes with their canalicles are seen. Scale bars: A = 250 μm; B = 100 μm.
Figure 5 in Paleohistological studies of bone and teeth in Gyrodus circularis (Gyrodidae: Pycnodontiformes: Actinopterygii). Phylogenetic implications for the Gyrodidae
Figure 5. – Gyrodus circularis. (MNHN. JRE 540). Ground sections (MNHN-F-Histos 2743) (transmitted natural light). A: Detail of the right side of the tooth (see Fig. 2) showing the presence of spheritic dentine (arrowheads) and the spongy alveolar bone (ab). B: (MNHNF-Histos 2741) Detail of dentine showing the parallel odontoblastic canalicles and two odontocytes (arrows) and the spheritic dentine (arrowheads). C: Detail of two odontocytes with their thick parallel canalicles. The arrowhead points to the spheritic dentine pulpar wall; de: dentine; pc: pulp cavity. Scale bars: A = 100 μm; B = 100 μm; C = 10 μm.
Figure 1 in Paleohistological studies of bone and teeth in Gyrodus circularis (Gyrodidae: Pycnodontiformes: Actinopterygii). Phylogenetic implications for the Gyrodidae
Figure 1. – Gyrodus circularis. (MNHN. JRE 540). A: View of the surface of the prearticular with the various molariform teeth. The arrow indicates the localisation of the axial sections. The horizontal sections are delimited by the two brackets. The white asterisk points to the tooth of the inset B. Inset B: Detail showing the microreliefs of the crown surface of the tooth pointed with the asterisk. The white arrowhead points to the central relief. Scale bars: A = 10 mm; B = 5 mm).
Fig. 3 in New insight into the distribution and palaeobiology of the pycnodont fish Gyrodus
Fig. 3. Late Jurassic pycnodonts to exemplify the body form and arrangement of unpaired fins. A. Gyrodus hexagonus (de Blainville, 1818) (JME SOS 3163) from the Tithonian of Eichstätt, southern Germany. B. Apomesodon gibbosus (Wagner, 1851) (JME SOS 3572a) from the Tithonian of Eichstätt, southern Germany. Scale bars 5 cm.
Fig. 2 in New insight into the distribution and palaeobiology of the pycnodont fish Gyrodus
Fig. 2. Dental remains of Gyrodus spp. A. Right prearticular dentition of Gyrodus sp. (NLH 102.971) from the lower Barremian of clay pit "Gott"; occlusal (A1), mesial (A2), and lateral (A3) views. B. Fragmentary prearticular dentition of Gyrodus sp. (NLH 102.972) from the Hauterivian of clay pit "Engelbostel"; occlusal view. C. Articulated prearticulars of Gyrodus hexagonus (de Blainville, 1818) (MB.f. 1345) from the Kimmeridgian of Solnhofen, Bavaria; occlusal view. D. Posterior principle prearticular teeth of Gyrodus hexagonus (de Blainville, 1818) (BSP−AS VII 1073) from the Kimmeridgian of Solnhofen, Bavaria; occlusal view. E. Latero−posterior prearticular tooth of Gyrodus hexagonus (de Blainville, 1818) (MB.f. 1367) from the Kimmeridgian of Solnhofen, Bavaria; occlusal view. F. Left prearticular of Gyrodus circularis Agassiz, 1844 (JM SOS 3130) from the Kimmeridgian of Wintershof, Bavaria; occlusal view. G. Unidentified pycnodont vomer (aff. Gyrodus? sp.) (MB.f. 7133) from the Hauterivian, Lower Cretaceous, of Langenberg near Oker, northern Germany; occlusal view. H. Left prearticular of an unidentified pycnodont (aff. Gyrodus? sp.) (MB.f. 7233) from an Lower Cretaceous erratic of the Baltic Sea; occlusal view. Scale bars 5 mm.
Fig. 1 in New insight into the distribution and palaeobiology of the pycnodont fish Gyrodus
Fig. 1. General sketch map of Germany (A) with position of the clay pits "Gott" and "Engelbostel" (B) that yielded the dental remains described herein. Abbreviations: E, clay pit "Engelbostel"; G, clay pit "Gott"; H, Hanover.
Figure 7 in Paleohistological studies of bone and teeth in Gyrodus circularis (Gyrodidae: Pycnodontiformes: Actinopterygii). Phylogenetic implications for the Gyrodidae
Figure 7. – Gyrodus circularis. (MNHN. JRE 540). Ground transversal sections (transmitted natural light). A: (MNHN-F-Histos 2748) Detail of alveolar bone showing numerous osteocytes with there ramified osteocytic canalicles. B: (MNHN-F-Histos 2743) Detail of the prearticular bony tissue with some vascular cavities and/or canals (vc). The white arrowheads point to osteoblastic canalicles. C: (MNHNF-Histos 2743) Detail of the contact dentine/bony tissue (de/bo). Bony tissue is crossed by some osteoblastic canalicles whose apical end is ramified (arrowheads). The arrows point to a cementing line between bone and dentine. D: (MNHN-F-Histos 2746) Detail of some osteoblastic canalicles (arrows) starting from vascular canals (vc) in the alveolar bone and of some star-shaped osteocytes (arrowheads). The end of the right osteoblastic canalicle is clearly ramified. Scale bars: A = 25 μm; B = 100 μm; C = 25 μm); D = 25 μm.
Figure 4 in Paleohistological studies of bone and teeth in Gyrodus circularis (Gyrodidae: Pycnodontiformes: Actinopterygii). Phylogenetic implications for the Gyrodidae
Figure 4. – Gyrodus circularis. Ground transversal sections of the teeth roots (transmitted natural light). A: (MNHN-F-Histos 2748) Detail of the orthodentine (od) showing the apical part of the odontoblastic canalicles that are clearly ramified to their extrem- ity (arrows); bo: bone. Inset: detail of a terminal ramification. B: The section (MNHN-F-Histos 2748) shows the contact between the orthodentine (od) with the alveolar bone (bo). The pulp surface of the dentine shows thin mineralized spherules (arrowheads) that project in the pulp cavity; pc = pulp cavity; vc: vascular cavity. C: (MNHN-F-Histos 2743) Detail of the spheritic orthodentine showing the Liesegang lines that mark the successive steps of mineralization in proportion of the thickening of the tooth. The upper Liesegang line is edged by mineralized spherules. The black arrowheads point to the more recent mineralized spherules that project in the pulp cavity (pc). Inset: Detail of several mineralized spherules (white arrowheads) inside the dentinous tissue (arrows). Scale bars: A = 25 μm; Inset A = 10 μm; B = 50 μm; C = 50 μm; inset C = 25 μm.
Figure 3 in Paleohistological studies of bone and teeth in Gyrodus circularis (Gyrodidae: Pycnodontiformes: Actinopterygii). Phylogenetic implications for the Gyrodidae
Figure 3. – Gyrodus circularis. (MNHN. JRE 540). Axial ground section (MNHN-F-Histos 2743). Detail of the crown of teeth No 1. The two parts of the dentine core are clearly seen: the circumpulpar orthodentine (od) with its fine laminations (arrowheads) and the upper thick layer of acrodine (ac) that is crossed by the odontoblastic canalicles that progressively get thinner and stop before the surface of the crown (arrow). The black pigmentation is restricted to the more external acrodine layer. The spheritic dentine (sd) is clearly seen at the top of the pulp cavity (pc). Scale bar = 10 μm.
Figure 2 in Paleohistological studies of bone and teeth in Gyrodus circularis (Gyrodidae: Pycnodontiformes: Actinopterygii). Phylogenetic implications for the Gyrodidae
Figure 2. – Gyrodus circularis. (MNHN. JRE 540). Ground sections (MNHN-F-Histos 2743) (transmitted natural light). A: Axial section (see Fig. 1) of a molariform tooth inserted in a bony sock- et (sb). The dentine walls show numerous mineralized granules (arrowheads). The asterisks point to neighbouring teeth. The alveolar bony tissue runs lightly over the base of the crown. ac: acrodine; bo: bony tissue; oc: odontoblastic canalicles; od: osteodentine. B to D: Three successive transversal sections of five neighbouring teeth (see Fig. 1), crossing different levels of the pulp cavities. Section B (MNHN-F-Histos 2745) crosses the apical crown of the smaller teeth and the higher part of the pulp cavity of the larger tooth. Section C (MNHN-F-Histos 2746) crosses the mid part of the pulp cavities of smaller teeth and the base of pulp cavity of the large one. Section D (MNHN-F-Histos 2748) crosses a relatively low part of the smaller teeth and the base of the pulp cavity of the larger tooth as revealed by the bony arches that occupy the main part of the pulp lumen (arrowhead). The pulp cavities of the four left teeth are circular whereas the pulp cavity of the larger right tooth is lightly ovoid. The walls of the pulp cavities of the five teeth are perfectly circular and constituted of orthodentine. The circum pulpar dentine shows spheritic mineralization (see Figs 3, 4). Each tooth is surrounded by spongy bony tissue characterized by thin trabeculae (see Fig. 6). Scale bars: A = 500 μm; B-D: = 2 mm.
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