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Fig. 1.35 Intraovarian insemination in: ( A ) Cauloramphus spinifer ;
( B – D , inset ) Tegella armifera . ( A ) Ovary with previtellogenic doublet
surrounded by immature spermatogenic tissue in hermaphrodite zooid
( arrows indicate sperm heads inside intraovarian space). ( B ) Sperm
( arrowed ) in mature ovary containing vitellogenic and previtellogenic
oocyte doublets. ( C ) Ovary with oocytes of various ages. Male pronucleus ( arrowed ) in early previtellogenic oocyte (see also inset)
(contact of the gonad with the basal cystid wall is out of the section
plane). ( D ) Peripheral area of ovary and mature spermatogenic tissue
in hermaphrodite zooid (male pronucleus in previtellogenic oocyte
arrowed ). Abbreviations: bw basal wall, f follicle cells, is intraovarian
space, ov ovary-wall cells, pd previtellogenic doublet, рос previtellogenic
oocyte, st spermatogenic tissue, voc vitellogenic oocyte. Scale bars:
A , C , D , 10 μm; B , 20 μm
1 Reproductive Patterns of Gymnolaemate Bryozoa: General Overview and Comparative Analysis