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Fig. 1.6 Structure of the ovary and oogenesis in Callopora lineata .
( A ) Late vitellogenic doublet and early previtellogenic oocyte in ovary
(intraovarian space outside the section plane). ( B ) Ovary containing
mature vitellogenic oocyte, with putative cell divisions ( arrowed and
magnifi ed in the inset ) seen in the ovary wall (contact of the ovary with
the cystid wall is out of the section plane). ( C ) Preovulatory vitellogenic
oocyte (intraovarian space arrowed ). ( D ) Partially ovulated oocyte
with its degrading nurse cell in the visceral coelom. Abbreviations:
bw basal wall, dz distal zooid, f follicle cells, fm frontal membranous
wall, lw lateral wall, mz maternal zooid, nc nurse cells, op operculum,
ov ovary-wall cells, poc previtellogenic oocyte, tw transverse wall,
voc vitellogenic oocyte. Scale bars: A , B , 10 μm; C , D , 20 μm
1 Reproductive Patterns of Gymnolaemate Bryozoa: General Overview and Comparative Analysis
Fig. 1.6 Structure of the ovary and oogenesis in Callopora lineata .
( A ) Late vitellogenic doublet and early previtellogenic oocyte in ovary
(intraovarian space outside the section plane). ( B ) Ovary containing
mature vitellogenic oocyte, with putative cell divisions ( arrowed and
magnifi ed in the inset ) seen in the ovary wall (contact of the ovary with
the cystid wall is out of the section plane). ( C ) Preovulatory vitellogenic
oocyte (intraovarian space arrowed ). ( D ) Partially ovulated oocyte
with its degrading nurse cell in the visceral coelom. Abbreviations:
bw basal wall, dz distal zooid, f follicle cells, fm frontal membranous
wall, lw lateral wall, mz maternal zooid, nc nurse cells, op operculum,
ov ovary-wall cells, poc previtellogenic oocyte, tw transverse wall,
voc vitellogenic oocyte. Scale bars: A , B , 10 μm; C , D , 20 μm
1 Reproductive Patterns of Gymnolaemate Bryozoa: General Overview and Comparative Analysis