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Fig. 1.33 Oogenesis and extraembryonic nutrition in: ( A , D )
Myriapora truncata ; ( B , C , E , F ) “ Calyptotheca ” variolosa . ( A )
Ooecial vesicle with embryophore adjoining early embryo in ovicell.
( B ) Early embryo in ovicell with developing placental analogue.
( C ) Late embryo in ovicell with fully developed placental analogue.
( D ) Vitellogenic doublet in ovary (yolk granules in cytoplasm of nurse
cell arrowed ). ( E ) Area of early embryophore adjoining (dark granules
arrowed ). ( F ) Vitellogenic oocyte in ovary (aggregations of dark
granules in follicle cells arrowed ). Abbreviations: bc brood cavity,
е embryo, ес ectooecium, en entooecium, f follicle cells, fe fertilization
envelope, is intraovarian space, m muscle strands of ooecial vesicle, mz
maternal zooid, nc nurse cell, o oocyte, of ovicell floor, ov ovarywall cells, pl placental analogue (embryophore), sf squamous follicle
cells, v ooecial vesicle. Scale bars: A – F , 20 μm
1 Reproductive Patterns of Gymnolaemate Bryozoa: General Overview and Comparative Analysis