Fig. 1

Borings in biomineralized substrates from the Eocene of Seven Rivers, Jamaica (a–c, f, g after Donovan et al. 2015, fig. 5a–e, respectively). a–c, gEntobia isp. a USNM 546142, rib fragment bored with some chambers infilled by white calcite. b USNM 546140, rib fragment showing apertures (right and left of center) and infilled chambers (left). c UF 166940, surface expression of a dense infestation in an ostreid; scale bar represents 50 mm. g UF 166937, calcite infill of a chamber. d–f Small round holes in shells, Oichnus ispp. dOichnus paraboloides Bromley, UF 166840, non-penetrative pit in Anomia. eOichnus paraboloides Bromley, UF 166844, non-penetrative pits in an ostreid. fOichnus simplex Bromley, UF 166847, non-penetrative pit in an ostreid; scale bar represents 2 mm. Scale bars represent 10 mm unless stated otherwise