Fig. 3 in Boring bryozoans: an investigation into the endolithic bryozoan family Penetrantiidae

Fig. 3 Scanning electron microscopic images of the apertures and opercula of five different penetrantiids. a Penetrantia concharum from Sweden. b P. cf. concharum from northern France. c–e P. irregularis from southern New Zealand. f P. parva from northern New Zealand. g P. parva from southern New Zealand. h P. cf. parva from New Caledonia. i–k Penetrantia sp. from Japan. Asterisk: rough surface area made of calcium carbonate chips. apn apertural notches, bt boring trace, exc exterior cuticle, op operculum, opg opercular groove, st stolon