Hyperopisus bebe (Lacepede, 1803)

Germain, Damien, Mondéjar-Fernández, Jorge & Meunier, François J., 2016, The detection of weakly developed plicidentine in teleost teeth using 3 D tomography, Cybium 40 (1), pp. 75-82 : 80

Hyperopisus bebe

On virtual cross-sections, the apex of some folds looks relatively sharp ( Fig. 4C ) contrary to the teeth of A. gigas , H. aimara and L. piscatorius , where the tip of folds is relatively rounded ( Fig. 2A, D, F ). Dentine seems relatively dense, and it is covered by a thick cap of hypermineralized enameloid ( Fig. 4B ).

Figures

Figure 2. - Tomographic imaging of the teeth of various teleostean taxa known to have plicidentine (see the text). A: Arapaima gigas (Arapaimatidae). Lingual dentary plate; the axially sectioned tooth (arrow) corresponds to figure 7 in Meunier et al. (2013); the tooth tip is covered by an enameloid cap (arrowheads); Inset: Virtual cross section of the base of several teeth at various levels, a number of which shows dentin folds in the pulp cavity (asterisks). B-D: Hoplias aimara (Hoplerythrinidae); right premaxilla; B: External view of a fang and a mid-sized caniniform tooth showing the basal ridges (asterisk) and the apical enameloid cap (arrow heads); C: Virtual axial section of the fang showing the folds in the pulp cavity (asterisk), the apical enameloid cap and the premaxillary bone; D: Virtual cross section of the fang (upper) and the mid-sized tooth (lower) showing regular primary folds (arrowheads) and external ridges (arrows); E-F: Lophius piscatorius (Lophiidae); tomographic image of anterior portion of the left palato-pterygoid; E: Basal ridges on the left external surface of a tooth (arrow head); on the right, pulp cavity of two teeth with obvious folds (white arrow). The black arrows point to the attachment bone (bo); F: Virtual cross section of the two teeth on the left on Fig. E; the folds are restricted to a part of the teeth. Scale bars: A, D = 1 mm; B, C, F = 2.5 mm; E = 5 mm.

Figure 4. - Hyperopisus bebe (Mormyridae); tomographic image of the lingual dentary plate. A: Dorsal view of the lingual plate showing a number of side-by-side teeth with roundish apex; white arrow points to anterior; B: Virtual model of a part of the lingual plate showing on the foreground two pulp cavities with dentine folds (arrow heads); the teeth are constituted of a dentine core covered by a thick enameloid cap; white and black asterisks point to the roundish apex of teeth (de = dentine; en = enameloid); C: Virtual section crossing the pulp cavity of several teeth; the central one (b) shows sharp folds (arrowheads). Section of tooth (a) crosses the higher part of the pulp cavity and the dentine (de) appears as a circular section; it is overlain by a thin enameloid layer (en). Scale bars: A = 2.5 mm; B = 1 mm; C = 0.5 µm.