Fig. 2

Schematic overview on the morphology of cheilostome bryozoans based on Electra posidoniae from the frontal side. The cystid (gray) is calcified. The polypide is composed of a lophophore (blue), digestive tract (green), musculature (pink) and the nervous system (cerebral ganglion in yellow). Abbreviations: a – anus, ca – cardia, cae – caecum, d – distal, db – duplicature bands, eso – esophagus, int – intestine, o – operculum, opo – operculum occlusor, p – proximal, pdi – parietodiaphragmatic muscle, ph – pharynx, pm – parietal muscle, py – pylorus, rm. – retractor muscle, sph – sphincter muscle, ts – tentacle sheath