FIGURE 3 in Holocephalan (Chondrichthyes) dental plates with hypermineralized dentine as a substitute for missing teeth through developmental plasticity

FIGURE 3 Chimaera spp., upper dentition, μCT-scans. (a)–(e) Subadult Chimaera monstrosa Linnaeus, 1758, (f)–(i) juvenile (20 cm) Chimaera sp. (unidentified), Taiwan. (a) C. monstrosa and (f) Chimaera sp., upper dentition in oral view, including anterior dental plate with ridges on the lingual surface of the dental plate. (b) C. monstrosa and (g) Chimaera sp., upper dentition rendered (Avizo) showing rods and ovoids of hypermineralized dentine (whitlockin) in both dental plates and tritoral pads in the posterior plate (g). (c) C. monstrosa, upper dentition in oral view, with posterior dental plate cut away to show internal structure, including ridges on the anterior dental plate. (d) C. monstrosa (i) Chimaera sp., anterior dental plate, cut away to show section through developing ovoids (hypermineralized whitlockin), surrounding trabecular dentine, sclerotic (hypermineralized) trabecular dentine and the ridges. In (d) the less mineralized ovoids can be seen at the aboral surface. (e) C. monstrosa, anterior and posterior dental plates, with opposing plates cut away to show symphyseal face of the anterior plate and the ridges, anterior ridge, or column, and posterior furrow on each side of the ridged zone (arrows labelled 1 and 2, as in Figure 2f). (h) Chimaera sp., anterior plate in oral view, with posterior dental plate cut away to show ridges on the anterior dental plate. Abbreviations as in previous figures. d, less mineralized dentine; tri, tritoral pad