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. 2017 Sep 12;231(6):869–885. doi: 10.1111/joa.12686

Figure 1.

Figure 1

Dental attachment tissues and their distributions across extant, tooth‐bearing amniotes. (A) Transverse section of the attachment tissues in a modern Pika (AMF histology slide collection, cabinet 28 tray 19). (B) Coronal section of the attachment tissues in the extinct mosasaurid Platecarpus (UALVP 57044). (C) Coronal section of the attachment tissues in the crocodilian Caiman sclerops (CMNAR 25747‐4). (D) Phylogenetic relationships of the extant tooth‐bearing amniote clades and reported presence of cementum, PDL, and alveolar bone in extinct clades (grey branches). Among extinct clades, cementum, PDL, and alveolar bone have been reported in (1) diadectids (LeBlanc & Reisz, 2013), (2) mesosaurs (Pretto et al. 2014), (3) early synapsids (LeBlanc et al. 2016a), (4) ichthyosaurs and pliosaurids (Maxwell et al. 2011; Sassoon et al. 2015), (5) non‐avian dinosaurs and toothed birds (Dumont et al. 2016; Fong et al. 2016; García & Zurriaguz, 2016; LeBlanc et al. 2016b). ab, alveolar bone; ac, acellular cementum; boa?, tissue interpreted as ‘bone of attachment’ by previous authors; cc, cellular cementum; ce, cementum (acellular and cellular); de, dentine; pdl, periodontal ligament.