Figure 7 in Histological study of the oral teeth and their bony support in the Mexican Jurassic gar †Nhanulepisosteus mexicanus (Ginglymodii, Lepisosteidae)

Figure 7. – Comparison of the pulp cavity of the fang teeth in four Lepisosteoidei. Cross sections are made in the mid part of the teeth. A: †Nhanulepisosteus mexicanus (specimen IGM 4902; see Brito et al., 2017). B: †Atractosteus sp.* from the Santonian of Hungary (specimen VER 2014.91.3). C: Atractosteus tropicus. D: Lepisosteus platostomus (See fig. 3C in Meunier and Brito, 2017) The pulp cavity is completely invaded by the dentigerous tissue in †N. mexicanus and in the Santonian †Atractosteus whereas the dentine plies let at least the central mid part in the two extant species. The tooth of †Atractosteus sp. has eusthenodont plicidentine whereas teeth of Atractosteus tropicus and Lepisosteus platostomus have polyplocodont plicidentine. Abbreviations: de: dentine; en: collar enamel; er: external ridges; pc: pulp cavity; rd: radial folding of the dentine; vs: vascular space; arrowheads: dentine folds. Scale bars: A, D = 250 μm; B = 500 μm; C = 150 μm * The photo of the ground section was given to us by Dr. Marton Szabó, Department of Paleontology and Geology, Hungarian Natural History Museum, Ludovika têr 2, Budapest 1083, Hungary.