Parasitology Research

, Volume 111, Issue 1, pp 135–142 | Cite as

Spermiogenesis and spermatozoon ultrastructure of the paruterinid cestode Notopentorchis sp. (Cyclophyllidea)

  • Aneta Yoneva
  • Céline Levron
  • Pavel N. Nikolov
  • Yana Mizinska
  • Jean Mariaux
  • Boyko B. Georgiev
Original Paper

Abstract

Ultrastructural characters of the spermiogenesis and mature spermatozoon of Notopentorchis sp. (Cestoda, Cyclophyllidea, Paruterinidae), a parasite from Apus affinis (Aves, Apodiformes, Apodidae) from Gabon, are described by means of transmission electron microscopy. Cytochemical analysis for detection of glycogen was applied. Vestigial striated roots associated with the two centrioles are present in the zone of differentiation. The spermiogenesis is characterized by an external growth of free flagellum followed by a proximodistal fusion of the latter with cytoplasmic protrusion, thus, corresponding to the cestode spermiogenesis of the type III pattern described by Bâ and Marchand (Mem. Mus. Natl. Hist. Nat. 166:87–95, 1995). In the final stage of spermiogenesis, a single crested body appears at the base of the forming spermatozoon. The mature spermatozoon of Notopentorchis sp. is filiform and tapering at both extremities. It consists of five regions differing in their ultrastructural characteristics. The anterior extremity of the mature spermatozoon is characterized by the presence of an apical cone and a single crested body. The cytoplasm contains one axoneme of 9 + “1” type of the trepaxonematan Platyhelminthes, a periaxonemal sheath, a layer of twisted cortical microtubules, transverse intracytoplasmic walls, and granules of glycogen. The nucleus is coiled in spiral around the axoneme. The posterior extremity of the spermatozoon is characterized by the presence of electron-dense material. This structural organization corresponds to the morphology of cestode spermatozoon of type VII as defined by Levron et al. (Biol Rev 85: 523-543, 2010). The comparison of the results with those of the two previous studies on paruterinids suggests that several characters of the spermiogenesis and the mature spermatozoon are invariable, i.e. the type III spermiogenesis and the presence of vestigial striated roots, a single crested body, a periaxonemal sheath, and intracytoplasmic walls. The main differences of the sperm cells among members of this family are the lack of dense granules (as in Triaenorhina rectangula) and the presence of electron-dense material in the posterior extremity of the spermatozoon (as in Notopentorchis sp.).

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Aneta Yoneva
    • 1
  • Céline Levron
    • 2
  • Pavel N. Nikolov
    • 1
  • Yana Mizinska
    • 1
  • Jean Mariaux
    • 3
  • Boyko B. Georgiev
    • 1
  1. 1.Institute of Biodiversity and Ecosystem ResearchBulgarian Academy of SciencesSofiaBulgaria
  2. 2.Institute of ParasitologyBiology Centre of the Academy of Sciences of the Czech RepublicČeské BudějoviceCzech Republic
  3. 3.Natural History Museum of Geneva1211 Geneva 6Switzerland

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