202
Fig. 2.46 Schematic longitudinal sections of brooding zooids with
internal brood sacs in: ( A ) Nematofl ustra fl agellata ; ( B ) “ Bifl ustra ” perfragilis ; ( C ) Gontarella sp. ( arrows indicate communication between
the brood-sac cavity and the environment) (From Ostrovsky et al.
2006 , courtesy of John Wiley and Sons, http://onlinelibrary.wiley.com/
doi/10.1002/jmor.10438/abstract ). Abbreviations: av vibraculum
(setiform avicularium), bsw brood-sac wall, bz brooding zooid, bw
basal wall, cr cryptocyst, d diaphragm, dz distal zooid, fm membranous
frontal wall, m muscle strands of ooecial vesicle and brood sac, op
operculum, sc sclerite of ooecial vesicle, ts tentacle sheath, tw transverse wall, v ooecial vesicle, ve vestibulum
2 Cheilostome Brood Chambers: Structure, Formation, Evolution
Fig. 2.46 Schematic longitudinal sections of brooding zooids with
internal brood sacs in: ( A ) Nematofl ustra fl agellata ; ( B ) “ Bifl ustra ” perfragilis ; ( C ) Gontarella sp. ( arrows indicate communication between
the brood-sac cavity and the environment) (From Ostrovsky et al.
2006 , courtesy of John Wiley and Sons, http://onlinelibrary.wiley.com/
doi/10.1002/jmor.10438/abstract ). Abbreviations: av vibraculum
(setiform avicularium), bsw brood-sac wall, bz brooding zooid, bw
basal wall, cr cryptocyst, d diaphragm, dz distal zooid, fm membranous
frontal wall, m muscle strands of ooecial vesicle and brood sac, op
operculum, sc sclerite of ooecial vesicle, ts tentacle sheath, tw transverse wall, v ooecial vesicle, ve vestibulum
2 Cheilostome Brood Chambers: Structure, Formation, Evolution