@prefix rdf: . @prefix rdfs: . @prefix bibo: . @prefix cito: . @prefix dc: . @prefix dwc: . @prefix dwcFP: . @prefix fabio: . @prefix trt: . cito:cites , , , , , , ; dc:creator "Brito, Paulo M.; Alvarado-Ortega, Jésus; Meunier, François J." ; dc:title "Nhanulepisosteus mexicanus" ; trt:augmentsTaxonConcept ; trt:citesTaxonName , ; trt:publishedIn ; a trt:Treatment . bibo:endPage "18" ; bibo:issue "1" ; bibo:journal "Cybium" ; bibo:startPage "13" ; bibo:volume "46" ; dc:creator "Brito, Paulo M.; Alvarado-Ortega, Jésus; Meunier, François J." ; dc:date "2022" ; dc:title "Histological study of the oral teeth and their bony support in the Mexican Jurassic gar † Nhanulepisosteus mexicanus (Ginglymodii, Lepisosteidae)" ; fabio:hasPart , , , , ; a fabio:JournalArticle . dwc:authority "Brito, Alvarado-Ortega & Meunier, 2017" ; dwc:authorityName "Brito, Alvaro-Ortega & Meunier" ; dwc:authorityYear "2017" ; dwc:class "Actinopterygii" ; dwc:family "Lepisosteidae" ; dwc:genus "Nhanulepisosteus" ; dwc:kingdom "Animalia" ; dwc:order "Lepisosteiformes" ; dwc:phylum "Chordata" ; dwc:rank "species" ; dwc:scientificNameAuthorship "Brito, Alvarado-Ortega & Meunier, 2017" ; dwc:species "mexicanus" ; trt:hasTaxonName ; a dwcFP:TaxonConcept . dwc:authority "(Late Cretaceous)" ; dwc:baseAuthorityName "Late Cretaceous" ; dwc:family "Lepisosteidae" ; dwc:genus "Atractosteus" ; dwc:kingdom "Animalia" ; dwc:order "Lepisosteiformes" ; dwc:phylum "Chordata" ; dwc:rank "species" ; dwc:scientificNameAuthorship "(Late Cretaceous)" ; dwc:species "africanus" ; trt:hasTaxonName ; a dwcFP:TaxonConcept . dwc:authority "(Late Cretaceous)" ; dwc:baseAuthorityName "Late Cretaceous" ; dwc:family "Lepisosteidae" ; dwc:genus "Atractosteus" ; dwc:kingdom "Animalia" ; dwc:order "Lepisosteiformes" ; dwc:phylum "Chordata" ; dwc:rank "species" ; dwc:scientificNameAuthorship "(Late Cretaceous)" ; dwc:species "occidentalis" ; trt:hasTaxonName ; a dwcFP:TaxonConcept . dwc:class "Actinopterygii" ; dwc:family "Lepisosteidae" ; dwc:genus "Nhanulepisosteus" ; dwc:kingdom "Animalia" ; dwc:order "Lepisosteiformes" ; dwc:phylum "Chordata" ; dwc:rank "species" ; dwc:species "mexicanus" ; trt:hasParentName ; a dwcFP:TaxonName . dwc:class "Actinopterygii" ; dwc:family "Lepisosteidae" ; dwc:genus "Nhanulepisosteus" ; dwc:kingdom "Animalia" ; dwc:order "Lepisosteiformes" ; dwc:phylum "Chordata" ; dwc:rank "genus" ; trt:hasParentName ; a dwcFP:TaxonName . dwc:family "Lepisosteidae" ; dwc:kingdom "Animalia" ; dwc:order "Lepisosteiformes" ; dwc:phylum "Chordata" ; dwc:rank "family" ; trt:hasParentName ; a dwcFP:TaxonName . dwc:order "Lepisosteiformes" ; dwc:rank "order" ; trt:hasParentName ; a dwcFP:TaxonName . dwc:class "Actinopterygii" ; dwc:rank "class" ; trt:hasParentName ; a dwcFP:TaxonName . dwc:phylum "Chordata" ; dwc:rank "phylum" ; trt:hasParentName ; a dwcFP:TaxonName . dwc:kingdom "Animalia" ; dwc:rank "kingdom" ; a dwcFP:TaxonName . dc:description "Figure 1. – †Nhanulepisosteus mexicanus: External view of the fossil sample (IGM 4901) showing four caniniform teeth with their apical cap of acrodine (arrows). Two small teeth are seen between the fangs (arrowheads). Scale bar = 1 mm." ; fabio:hasRepresentation ; a fabio:Figure . dc:description "Figure 3. – †Nhanulepisosteus mexicanus: Histological organization of the fangs (natural transmitted light). A: Axial section of a tooth. The pulp cavity (pc) is totally occupied by axial trabeculae of dentine (de) alternating with pulp spaces. The tooth is fixed on a basement of reconstructed bone (bo). vc = vascular cavities. B-D: Three cross-sections of different levels of a tooth. B: The section is localized at the tooth base; it shows a ridged crown of orthoden- tine surrounded by a thin layer of enameloid (en). The pulp cavity is occupied by vascularized dentine. On the bottom of the fig, the bone of attachment (bo). C: The section crosses the mid part of the pulp cavity. The tooth is constituted of a crown of orthodentine (de) surrounded by a layer of enamel (en) showing external crests. The pulp cavity is totally occupied by vascular- ized dentine. D: The section is in the higher part of the pulp cavity. The tooth is constituted of a crown of orthodentine (de) surrounded by the crenulated enamel (en). We can see the pulp cav- ity which is reduced. E: Cross-section in the mid part of the tooth. Details of the dentine show- ing the peripheral orthodentine layer (white asterisks), with its ondontoblastic canalicles and the vascular canals fit together. Each canal is surrounded by orthodentine (black arrow-head). The enameloid layer is crenulated (white arrow-heads). A: IGM 4902-5; B: IGM 4902-3; C,E: IGM 4902-2; D: IGM 4902-1. Scale bars:A, B, C = 200 μm; D = 100 μm; E = 50 μm." ; fabio:hasRepresentation ; a fabio:Figure . dc:description "Figure 4. – †Nhanulepisosteus mexicanus. A-B: IGM 4902-5. Cross-section (respectively natural and polarized transmitted light) of a small tooth. We can show a crown of dentine (de), with an external crenulated layer of enameloid (arrow-heads). The pulp cavity (pc) is empty and its wall is regular. Scale bar = 100 μm." ; fabio:hasRepresentation ; a fabio:Figure . dc:description "Figure 5. – †Nhanulepisosteus mexicanus: A: Pharyngeal dentigerous plate. We can see cross (white and black arrow-heads) and axial (white and black arrows) sections of minute teeth. We can also see a section of a scale (sc) (bo = bony tissue). B: Axial section of a pharyngeal tooth (white arrow) and its supporting bony plate (bp). A: IGM 4902-4; B: IGM 4902-5. Scale bars: A = 200 μm; B = 100 μm." ; fabio:hasRepresentation ; a fabio:Figure . dc:description "Figure 6. – †Nhanulepisosteus mexi- canus: Histological organization of the teeth supporting bone. A: Detail of the basal contact of a tooth (pc) and its supporting bone (bo) with vascu- lar canals or cavities (vc). The white arrows point to osteons. B: Detail of the dentigerous plate showing lamel- lar bone and numerous cementing lines (black arrow-heads) that character- ized an intensive remodeling of bone tissue below the tooth. We also show canalicles of Williamson (arrows). The asterisks point to secondary osteons. C-D: Detail of the secondary osteon (**) of Fig. 6B (respectively natural and polarized transmitted light). The secondary bone of the osteons is lamel- lar bone (black asterisks). The arrow- heads point to cementing line. We also show canalicles of Williamson (black arrows). E: Detail of the secondary osteon (*) of Fig. 6B showing canal- iculi of Williamson (black arrows) and osteocytes (black arrowheads). A: IGM 4902-4; B, C, D, E: IGM 4902- 5. Scale bars: A = 200 μm; B = 100 μm; C, D = 50 μm; E = 25 μm." ; fabio:hasRepresentation ; a fabio:Figure .