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Fig. 1.26 Structure of the ovary and oogenesis in Celleporella hyalina . ( A ) Young female zooid with distal kenozooid, polypide primordium and early ovary ( arrowed ). ( B ) Vitellogenic doublet and
two previtellogenic doublets in ovary. ( C ) Oogonium and previtellogenic doublet in ovary (sperm head in previtellogenic oocyte
arrowed ). ( D ) Two sperm ( arrowed ) in the intraovarian zone of an
ovary with a growing oocyte. ( E ) Female zooid with early vitellogenic oocyte in the ovary, an undeveloped placental analogue and a
rudimentary polypide. ( F ) Early vitellogenic oocyte doublet in ovary
( A , F from Ostrovsky 1998 , courtesy of John Wiley and Sons, http://
onlinelibrary.wiley.com/doi/10.1111/j.1463-6395.1998.tb01280.x/
abstract ). Abbreviations: bc brood cavity, bw basal wall, dk distal
kenozooid, f follicle cells, fs funicular strand, fw frontal wall, nc nurse
cell, o oocyte, ое ooecium, og oogonium, op operculum, pl placental
analogue (embryophore), pr rudimentary polypide of female zooid,
poc previtellogenic oocyte, sf squamous follicle cells, tw transverse
wall, v ooecial vesicle, voc vitellogenic oocyte. Scale bars: A , 40 μm;
B , 10 μm; C , 20 μm
Figures