180
Fig. 2.22 Schematic longitudinal sections of hyperstomial ovicells in:
( A ) Tegella armifera (ovicell acleithral; arrow indicates ooecial communication pore plugged by non-specialized epithelial cells); ( B ) Corbulella
maderensis (ovicell cleithral; ooecial walls fused to form a solid common
wall, which is perforated by fungal hyphae) (From Ostrovsky et al.
2009a , courtesy of Springer Verlag, http://link.springer.com/article/
10.1007/s00435-008-0070-8 ). Abbreviations: av avicularium, bc brood
cavity, bw basal wall, cr cryptocyst, dz distal zooid, ес ectooecium, en
entooecium, fm membranous frontal wall, m muscle strands of ooecial
vesicle, mz maternal zooid, oc ooecial coelom, ое ooecium, of ovicell
fl oor, op operculum, sc sclerite of ooecial vesicle, tw transverse wall, v
ooecial vesicle, vw vertical wall between coelomic cavities of ooecium
and avicularium
2 Cheilostome Brood Chambers: Structure, Formation, Evolution
Fig. 2.22 Schematic longitudinal sections of hyperstomial ovicells in:
( A ) Tegella armifera (ovicell acleithral; arrow indicates ooecial communication pore plugged by non-specialized epithelial cells); ( B ) Corbulella
maderensis (ovicell cleithral; ooecial walls fused to form a solid common
wall, which is perforated by fungal hyphae) (From Ostrovsky et al.
2009a , courtesy of Springer Verlag, http://link.springer.com/article/
10.1007/s00435-008-0070-8 ). Abbreviations: av avicularium, bc brood
cavity, bw basal wall, cr cryptocyst, dz distal zooid, ес ectooecium, en
entooecium, fm membranous frontal wall, m muscle strands of ooecial
vesicle, mz maternal zooid, oc ooecial coelom, ое ooecium, of ovicell
fl oor, op operculum, sc sclerite of ooecial vesicle, tw transverse wall, v
ooecial vesicle, vw vertical wall between coelomic cavities of ooecium
and avicularium
2 Cheilostome Brood Chambers: Structure, Formation, Evolution