Biology Bulletin

, Volume 41, Issue 9, pp 722–735 | Cite as

Ultrastructure of oocytes and female copulatory organs of Acoela

  • Ya. I. Zabotin
  • A. I. Golubev


The ultrastructure of oocytes in four Acoela species representing different families (Archaphanostoma agile, Otocelis rubropunctata, Symsagittifera japonica, and Amphiscolops sp.) and of female copulatory organs (bursae) in S. japonica and Amphiscolops sp. is described for the first time. The sister relationship between the families Sagittiferidae and Convolutidae is confirmed by the similarity of their reproductive apparatus structure. It is suggested the ultrastructure of oocytes and specific features of oogenesis can be used in the phylogenetics of Acoela.


Acoela reproductive system oocytes ultrastructure taxonomy phylogeny 


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© Pleiades Publishing, Inc. 2014

Authors and Affiliations

  1. 1.Kazan (Volga Region) Federal UniversityKazanRussia

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