197
Fig. 2.41 Schematic longitudinal sections of hyperstomial cleithral
ovicells in: ( A ) Rhamphostomella ovata ; ( B ) Rhamphostomella radiatula ; ( C ) Rhamphostomella сostata ( arrows indicate ooecial communication pores; in A normal position of operculum shown by dotted line ).
Abbreviations: as ascus, bw basal wall, dz distal zooid, ес ectooecium,
en entooecium, fr frontal shield, hc hypostegal coelom, m muscle
strands of ooecial vesicle, mz maternal zooid, ос ooecial coelom, of
ovicell fl oor, op operculum, рр pseudopore, scn secondary calcifi cation,
tw transverse wall, v ooecial vesicle
Figures
Fig. 2.41 Schematic longitudinal sections of hyperstomial cleithral
ovicells in: ( A ) Rhamphostomella ovata ; ( B ) Rhamphostomella radiatula ; ( C ) Rhamphostomella сostata ( arrows indicate ooecial communication pores; in A normal position of operculum shown by dotted line ).
Abbreviations: as ascus, bw basal wall, dz distal zooid, ес ectooecium,
en entooecium, fr frontal shield, hc hypostegal coelom, m muscle
strands of ooecial vesicle, mz maternal zooid, ос ooecial coelom, of
ovicell fl oor, op operculum, рр pseudopore, scn secondary calcifi cation,
tw transverse wall, v ooecial vesicle
Figures