98
Fig. 1.27 Oogenesis, ovicell structure and matrotrophic incubation of
the embryo in Celleporella hyalina . ( A ) Preovulatory oocyte in ovary.
( B ) Mature vitellogenic doublet in ovary. ( C ) Early embryo ( right ) and
late embryo in ovicells (the latter closely adjoins the wall of the brood
cavity, while the younger embryo is separated from the entooecium by
free space). ( D ) Female zooid with ovary and late embryo in ovicell (the
embryo occupies all of the brood cavity adjoining the ooecial vesicle;
the placental analogue ( arrowed ) is well-developed); inset shows upper
distal part of female zooid (ascus musculature arrowed ) ( D and inset from
Ostrovsky 1998 , courtesy of John Wiley and Sons, http://onlinelibrary.
wiley.com/doi/10.1111/j.1463-6395.1998.tb01280.x/abstract ).
Abbreviations: as ascus, bb brown body, bc brood cavity, dk distal
kenozooid, е embryo, ес ectooecium, en entooecium, nc nurse cell,
o oocyte, ос ooecial coelom, ое ooecium, of ovicell fl oor, op operculum,
ov ovary-wall cells, p polypide, zo zooeciule. Scale bars: A , C , D ,
20 μm; B , 10 μm; inset , 30 μm
1 Reproductive Patterns of Gymnolaemate Bryozoa: General Overview and Comparative Analysis
Fig. 1.27 Oogenesis, ovicell structure and matrotrophic incubation of
the embryo in Celleporella hyalina . ( A ) Preovulatory oocyte in ovary.
( B ) Mature vitellogenic doublet in ovary. ( C ) Early embryo ( right ) and
late embryo in ovicells (the latter closely adjoins the wall of the brood
cavity, while the younger embryo is separated from the entooecium by
free space). ( D ) Female zooid with ovary and late embryo in ovicell (the
embryo occupies all of the brood cavity adjoining the ooecial vesicle;
the placental analogue ( arrowed ) is well-developed); inset shows upper
distal part of female zooid (ascus musculature arrowed ) ( D and inset from
Ostrovsky 1998 , courtesy of John Wiley and Sons, http://onlinelibrary.
wiley.com/doi/10.1111/j.1463-6395.1998.tb01280.x/abstract ).
Abbreviations: as ascus, bb brown body, bc brood cavity, dk distal
kenozooid, е embryo, ес ectooecium, en entooecium, nc nurse cell,
o oocyte, ос ooecial coelom, ое ooecium, of ovicell fl oor, op operculum,
ov ovary-wall cells, p polypide, zo zooeciule. Scale bars: A , C , D ,
20 μm; B , 10 μm; inset , 30 μm
1 Reproductive Patterns of Gymnolaemate Bryozoa: General Overview and Comparative Analysis