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. 2018 Nov 7;285(1890):20181792. doi: 10.1098/rspb.2018.1792

Figure 2.

Figure 2.

‘Mammal’-like tooth attachment in non-mammalian therapsids. (a) Illustration of the tooth attachment tissues in a gomphosis. (b) Close-up of the tooth attachment tissues in an extant badger under cross-polarized light, showing the Sharpey's fibres of the PDL in the cementum and alveolar bone. (c) Transverse section of a tooth of a gorgonopsian (BP/1/784). (d) Close-up of the periodontal tissues in (c). (e) Coronal section of a tooth of an indeterminate therocephalian (BP/1/172). (f) Close-up of periodontal tissues in (e). (g) Coronal section of a tooth in the therocephalian Bauria (BP/1/2523). (h) Close-up of periodontal tissues in (g) under cross-polarized light. (i) Transverse section of a tooth in the cynodont Cynognathus (BP/1/6097). (j) Close-up of the periodontal tissues in (i) under cross-polarized light. (k) Coronal section of a tooth in the cynodont Diademodon (BP/1/4652). (l) Close-up of the periodontal tissues in (k) under cross-polarized light. pdl, periodontal ligament; sf, Sharpey's fibres.