%0 Journal Article %D 2022 %T Histological study of the oral teeth and their bony support in the Mexican Jurassic gar †Nhanulepisosteus mexicanus (Ginglymodii, Lepisosteidae) %A Brito, Paulo M. %A Alvarado-Ortega, Jésus %A François J Meunier %K Bone %K Jurassic %K Lepisosteidae %K Palaeohistology %K plicidentine %K Teeth %K †Nhanulepisosteus %X The palaeohistology of the teeth and bony skeleton of the Late Jurassic gar †Nhanulepisosteus mexi­canus is described in detail from thin sections. The teeth are composed of a cone of orthodentine with a pulp cavity filled with parallel canals of osteodentine as variety of eusthenodont type plicidentine. These conspicu­ous histological features differentiate †Nhanulepisosteus from the majority of extant and fossil lepisosteids. The teeth are crowned with a small apical cap of acrodine, and are surrounded by a ridged layer of enamel. The bony tissues contain star-shaped osteocytes and canaliculi of Williamson matching exactly those in living lepisosteids, other holosteans, and some basal teleosts. Although the dental histology is distinct from that of extant gar spe­cies, we consider these differences are related to eco-morphological factors, noting that this pattern of histologi­cal arrangement is also found in other fossil gar species. %G eng %U https://www.sfi-cybium.fr/fr/histological-study-oral-teeth-and-their-bony-support-mexican-jurassic-gar-†nhanulepisosteus %R 10.26028/CYBIUM/2022-461-002