Acta Parasitologica

, Volume 51, Issue 4, pp 264–272

Ultrastructure of spermiogenesis and mature spermatozoon of Angularella beema (Clerc, 1906) (Cestoda, Cyclophyllidea, Dilepididae)

  • Aneta Yoneva
  • Jordi Miquel
  • Zdzisław Świderski
  • Katia Georgieva
  • Yana Mizinska
  • Boyko B. Georgiev
Article

DOI: 10.2478/s11686-006-0040-6

Cite this article as:
Yoneva, A., Miquel, J., Świderski, Z. et al. Acta Parasit. (2006) 51: 264. doi:10.2478/s11686-006-0040-6
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Abstract

The ultrastructure of the spermiogenesis of a dilepidid cestode species is described for the first time. The spermiogenesis of Angularella beema is characterised by absence of both flagellar rotation and proximodistal fusion. The differentiation zone is surrounded by cortical microtubules and is delimited by a ring of arching membranes. It contains two centrioles, one of which develops the axoneme that grows directly into the elongating cytoplasmic protrusion. This pattern of spermiogenesis was described as the Type IV spermiogenesis of cestodes. Among cestodes, similar pattern of spermiogenesis is known in the family Hymenolepididae and in some representatives of the family Anoplocephalidae. The mature spermatozoon of A. beema consists of five regions differing in their ultrastructural characteristics. It is characterised by the presence of cortical microtubules (spirally arranged at angle of 30–40° to the spermatozoon axis) and a single crested body. There is a periaxonemal sheath in certain parts of the spermatozoon as well as glycogen-like granules between the periaxonemal sheath and the cortical microtubules. The comparisons of the mature spermatozoon of A. beema with those of other two dilepidid species (Dilepis undula and Molluscotaenia crassiscolex) demonstrate some variation within the family: presence of periaxonemal sheath in A. beema and D. undula and its absence in M. crassiscolex; presence of electron-dense rods in D. undula and their absence in A. beema.

Key words

Cestoda Cyclophyllidea Dilepididae Angularella beema spermiogenesis spermatozoon ultrastructure 

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Copyright information

© W. Stefański Institute of Parasitology, PAS 2006

Authors and Affiliations

  • Aneta Yoneva
    • 1
  • Jordi Miquel
    • 2
  • Zdzisław Świderski
    • 3
    • 4
  • Katia Georgieva
    • 1
  • Yana Mizinska
    • 1
  • Boyko B. Georgiev
    • 5
    • 6
  1. 1.Institute of Experimental Pathology and ParasitologyBulgarian Academy of SciencesSofiaBulgaria
  2. 2.Laboratori de Parasitologia, Departament de Microbiologia i Parasitologia Sanitàries, Facultat de FarmàciaUniversitat de BarcelonaBarcelonaSpain
  3. 3.W. Stefański Institute of ParasitologyPolish Academy of SciencesWarsawPoland
  4. 4.Department of General Biology and ParasitologyWarsaw Medical UniversityWarsawPoland
  5. 5.Central Laboratory of General EcologyBulgarian Academy of SciencesSofiaBulgaria
  6. 6.Department of ZoologyThe Natural History MuseumLondonUK

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