Fig. 3 in New bioerosion traces in rhynchosaur bones from the Upper Triassic of Brazil and the oldest occurrence of the ichnogenera Osteocallis and Amphifaoichnus

Fig. 3. Arthropod bioerosion trace fossil Amphifaoichnus isp. on bone fragments of the rhynchosaurid archosauromorph Hyperodapedon mariensis (Tupi Caldas, 1933) from Buriol Site, Brazil, Hyperodapedon AZ, Carnian. A. UFRGS-PV-1581-T #3; A1, close up showing Amphifaoichnus isp. (note the bone chips) associated to a perpendicular boring (dashed outline) and feeding traces of Osteocallis mandibulus Roberts et al., 2007 (arrow; see also Fig. 4A1); A2, axial view of µCT scan showing the internal morphology of the tube, meniscate structures and the perpendicular boring; A3, coronal view of µCT scan showing the trace (dotted surface) and the destruction of both cortical (black outline) and trabecular bone. B. UFRGS-PV-1581-T #4; B1, specimen arrow) showing the uneven distribution of bone chips in the filling; B2, specimen in transversal view showing the rounded morphology of the filling. C. UFRGS-PV-1581-T #10; C1, specimen in negative relief with a small portion of filling still preserved (arrow); C2, close up of filling; C3, specimen in transversal view showing the U-shape of the boring.