100
Fig. 1.30 Oogenesis and brooding in Antarctothoa sp. ( A ) Vitellogenic
doublet in ovary (intraovarian space arrowed ). ( B ) Early embryo in terminal ovicell. Abbreviations: bc brood cavity, dk distal kenozooid, е embryo,
ес ectooecium, en entooecium, fe fertilization envelope, i introvert,
m muscle strands of ooecial vesicle, mz maternal zooid, o oocyte,
oc ooecial coelom, ое ooecium, of ovicell fl oor, op operculum, p polypide,
рс basal pore chamber, poc previtellogenic oocyte, sc sclerite of ooecial
vesicle, tw transverse wall, v ooecial vesicle. Scale bars: A , B , 20 μm
Fig. 1.31 Ooecial vesicle with embryophore in: ( A ) Klugefl ustra
antarctica ; ( B ) Isosecurifl ustra angusta (ooecial vesicle folded during
fi xation). Abbreviations: dz distal autozooid, е embryo, i introvert,
mz maternal zooid, of ovicell fl oor, op operculum, pl placental analogue (embryophore), tw transverse wall, v ooecial vesicle. Scale bars:
A , B , 20 μm
1 Reproductive Patterns of Gymnolaemate Bryozoa: General Overview and Comparative Analysis