Fig. 10
Pachyzoon grischenkoi sp. nov. Reproductive details. Semithin sections. a Basal and lateral body wall showing spermatogenic tissue on the lateral wall. b Basal colony area showing ovaries with oocytes of different sizes. c Embryo inside of maternal, degenerated zooid. d Early embryo. Note also cup-shaped cuticular structures. e Detail of embryo showing high amounts of yolk. Abbreviations: bbw basal body wall, fbw frontal body wall, int intestine, l lophophore, ooc oocytes, pm parietal muscles, rm retractor muscle, te testis