Fig. 1From: The nervous system in the cyclostome bryozoan Crisia eburnea as revealed by transmission electron and confocal laser scanning microscopyOrganization of colony and zooids in Crisia eburnea. Photographs of live animals (a-b) and semithin sections (C-E). a A part of colony. b The same colony in higher magnification: tentacles and pores (arrowheads) in the wall of cystids are visible. c Sagittal longitudinal section of distal portion of zooid; tentacles semi-retracted. d Eight tentacles in the cross section. e Cross section of two branches of the digestive tract. Abbreviations: a – anus; as – atrial sphincter; ca – cardia; cae – caecum; cl – calcified layer; cg – cerebral ganglion; ec – epidermis; es – esophagus; int – intestine; lph – lophophore; mo – mouth; ms – membranous sac; pe – unmineralized cuticle; ph – pharynx; py - pylorus; t – tentacle; ts – tentacle sheath; z – zooidBack to article page