188
Fig. 2.32 Schematic longitudinal sections of endozooidal acleithral
ovicells in: ( A ) Securifl ustra securifrons ; ( B ) Spiralaria fl orea .
Abbreviations: av avicularium, bw basal wall, dz distal zooid, ес
ectooecium, en entooecium, fm membranous frontal wall, k kenozooid,
m muscle strands of ooecial vesicle, mz maternal zooid, ос ooecial
coelom, of ovicell fl oor, op operculum, sc sclerite of ooecial vesicle, tw
transverse wall, v ooecial vesicle
2 Cheilostome Brood Chambers: Structure, Formation, Evolution
Fig. 2.32 Schematic longitudinal sections of endozooidal acleithral
ovicells in: ( A ) Securifl ustra securifrons ; ( B ) Spiralaria fl orea .
Abbreviations: av avicularium, bw basal wall, dz distal zooid, ес
ectooecium, en entooecium, fm membranous frontal wall, k kenozooid,
m muscle strands of ooecial vesicle, mz maternal zooid, ос ooecial
coelom, of ovicell fl oor, op operculum, sc sclerite of ooecial vesicle, tw
transverse wall, v ooecial vesicle
2 Cheilostome Brood Chambers: Structure, Formation, Evolution