The oocytes are released from the germinal epithelia into the coelom at a relatively early stage of development during vitellogenesis.

• 雌性生殖细胞不形成合胞体,卵母细胞在发育的早期阶段,卵黄发生期间从卵巢(生殖上皮)排入体腔中,并在体腔中发育。