Fig. 23 in Boring bryozoans: an investigation into the endolithic bryozoan family Penetrantiidae

Fig. 23 Histology of the gonozooid in Penetrantia concharum from Sweden. a–c Longitudinal semi thin sections through a gonozooid with the brood chamber and anal side on the left. b Close-up of lophophore and tentacles. c Close-up of brood chamber and embryo. d Volume rendering based on a section series with the anal side on the left. at atrium, bc body cavity, bp brood chamber plug, bpm brood chamber plug muscle, c collar, d diaphragm, e embryo, exc exterior cuticle, ic interior cuticle, ics inter- cuticular space, l lophophore, ooc oocyte, op operculum, rm retractor muscle, sop secondary operculum, t tentacle, ts tentacle sheath, v vestibulum, vw vestibular wall