Arapaima gigas (Schinz, 1822)

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 : 79-80

Arapaima gigas , Hoplias aimara and Lophius piscatorius

Dentine folds are clearly noticeable in the basal part of the teeth, but they are limited to 1/3 to 1/2 of tooth height in A. gigas , H. aimara ( Fig. 2A, C ) and to the lower 1/ 3 in L. piscatorius fangs ( Fig. 2E ). On virtual cross sections

( Fig. 2A, D, F ), plicidentine folds look similar to the histologic pictures obtained using ground sections (see figs 13, 3A in Meunier et al., 2013, 2015a; fig. 3B, C in Meunier, 2015).

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.