Ultrastructure of the female gonad of two temnocephalids (Platyhelminthes,Rhabdocoela) |
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Authors: | Falleni Alessandra Lucchesi Paolo Gremigni Vittorio |
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Institution: | (1) Department of Human Morphology and Applied Biology, University of Pisa, Italy;(2) Dipartimento di Morfologia Umana e Biologia Applicata, Università di Pisa, Via A. Volta 4, 56100 Pisa, Italy. |
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Abstract: | The female gonad of Temnocephala dendyi and T. minor consists of a single germarium and two rows of vitellaria. It is enveloped
by an extracellular lamina and accessory cells. Accessory cells are only peripherally located in the germarium while their
cytoplasmic projections also fill the spaces between vitellocytes in the vitellarium. The main feature of oocyte maturation
is the appearance of chromatoid bodies and the development of rough endoplasmic reticulum (R.E.R.) and Golgi complexes which
appear to be correlated with the production of double-structured egg granules. The egg granules, which are localized in the
cortical cytoplasm of mature oocytes, contain glycoproteins, are devoid of polyphenols and are similar in structure and composition
to the cortical granules observed in some Digenea and Monogenea. Vitellocytes are typical secretory cells with well-developed
R.E.R. and Golgi complexes which are involved in the production of shell globules and yolk. The multigranular pattern and
the polyphenolic composition of the shell globules of the temnocephalids investigated are similar to those observed in other
rhabdocoels, and in some Prolecithophora and Neodermata. This feature may represent a synapomorphy shared by these taxa.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Platyhelminthes Temnocephalida female gonad ultrastructure cytochemistry |
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