Fig. 24 in Boring bryozoans: an investigation into the endolithic bryozoan family Penetrantiidae

Fig. 24 Musculature of the gonozooid in Penetrantia parva from northern New Zealand. a Overview of the gonozooid and brood chamber and their exterior cuticle. b Polypide within zooidal tube and embryo within brood chamber. c–d Musculature of gonozooid and brood chamber. Note: the additional brood chamber plug muscle. bch brood chamber, bpm brood chamber plug muscle, e embryo, mo mouth opening, oo operculum occlusor, op operculum, ply polypide, pm parietal muscles, pvm parieto-vestibular muscle, rm retractor muscle, ttm tentacle muscle