Fig. 4

Photosimulations of the dental microwear facet of placodonts. The areas are 637 × 468 μm (= 20 × magnification). The light blue arrows show pits, while the yellow arrows indicate scratches. a BSP 1967 I 324 Macroplacus raeticus, left p1. b SZTFH Ob.2323, Vt.3 Placochelys placodonta, left p2 of holotype c PIMUZ T 5927 Paraplacodus broilii distal palatine tooth d SMF R 368 Placodus gigas, left d4 e GPIT/RE/7290 Henodus chelyops II., left d f SMNS 16270 Cyamodus kuhnschnyderi, left p3 g MTM 64.67.1 Dugong dugon, left mx2 h MTM 64.68.1 Trichechus manatus, left d1. Abbreviations: d = dentary tooth, p = palatal tooth, mx = maxillary tooth