Fig. 6 in Bioerosion in shell beds from the Pliocene Roussillon Basin, France: Implications for the (macro)bioerosion ichnofacies model

Fig. 6. Different morphologies of the modular unit of grazing traces produced by a species of polyplacophoran and several species of gastropods. Only those produced by polyplacophorans and patellogastropods (white boxes) are likely to be preserved as fossils, because other groups bear unmineralized radulae. Figures redrawn from Jüch and Boekschoten (1980; L. cinereus and L. littorea), Thompson et al. (1997; P. vulgata, C. zizyphinum, Gibbula sp., and L. obtusata), Forrest et al. (2001; C. tramoserica and B. nanum), and Reyes et al. (2001; T. atra, F. peruviana, and L. ceciliana). In all cases, the direction of movement of the tracemaker would be towards the top of the page.