Advertisement

Parasitology Research

, Volume 79, Issue 4, pp 322–328 | Cite as

Ultrastructure of sperm and spermiogenesis ofPterastericola astropectinis (Platyhelminthes, Rhabdocoela, Pterastericolidae)

  • N. A. Watson
  • K. Rohde
  • U. Jondelius
Original Investigations

Abstract

During development of the spermatid, two free flagella are transported distally from the main spermatid mass by elongation of the shaft. They rotate back towards the shaft and lie parallel with it prior to fusion in a distal-proximal direction. This process conforms to that found in other free-living platyhelminths that have fused or adjoined axonemes in their sperm (Acoela, Kalyptorhynchia, Polycladida). It is basically different from the process of fusion in the majority of neodermatan species (major groups of parasitic platyhelminths), where the attachment of axonemes remains near the main spermatid body, a median process grows out between them, the nucleus and mitochondria migrate into this process and axonemes then fuse with it in a proximal-distal manner.Pterastericola astropectinis also differs from the Neodermata in the presence of dense bodies in the sperm. The ultrastructure of the sperm, spermiogenesis and protonephridia does not support the view of a close affinity between Pterastericolidae and Neodermata.

Keywords

Major Group Dense Body Median Process Close Affinity Parasitic Platyhelminth 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Boyer BC, Smith GW (1982) Sperm morphology and development in two acoel turbellarians from the Philippines. Pac Sci 36:365–380Google Scholar
  2. Brooks DR, O'Grady RT, Glen DR (1985) The phylogeny of the Cercomeria Brooks, 1982 (Platyhelminthes). Proc Helminthol Soc Wash 52:1–20Google Scholar
  3. Ehlers U (1985) Das phylogenetische System der Plathelminthes. Gustav Fischer, Stuttgart New YorkGoogle Scholar
  4. Farnesi RM, Marinelli M, Tei S, Vagnetti D (1977) Ultrastructural research on spermatogenesis inDugesia lugubris SL. Riv Biol 70:113–136Google Scholar
  5. Franquinet R, Lender T (1972) Quelques aspects ultrastructuraux de la spermiogenèse chezPolycelis tenuis etPolycelis nigra (Planaires). Z Mikrosk-Anat Forsch 86:481–495Google Scholar
  6. Hendelberg J (1969) On the development of different types of spermatozoa from spermatids with two flagella in the Turbellaria with remarks on the ultrastructure of the flagella. Zool Bidr Uppsala 38:1–50Google Scholar
  7. Hendelberg J (1974) Spermiogenesis, sperm morphology, and biology of fertilization in the Turbellaria. In: Riser NW, Morse MP (eds) Biology of the Turbellaria. McGraw-Hill, New York, pp 148–164Google Scholar
  8. Hendelberg J (1977) Comparative morphology of turbellarian spermatozoa studied by electron microscopy. Acta Zool Fenn 154:149–162Google Scholar
  9. Hendelberg J (1983) Trends in the evolution of flatworm spermatozoa. In: André J (ed) The sperm cell. Martinus Nijhoff, The Hague, pp 450–453Google Scholar
  10. Hendelberg J (1986) The phylogenetic significance of sperm morphology in the Platyhelminthes. Hydrobiologia 132:53–58Google Scholar
  11. Hyman LH (1951) The invertebrates: Platyhelminthes and Rhynchocoela. McGraw-Hill, New YorkGoogle Scholar
  12. Ishida S, Yamashita Y, Teshirogi W (1991) Analytical studies of the ultrastructure and movement of the spermatozoa of freshwater triclads. Hydrobiologia 227:95–104Google Scholar
  13. Jondelius U (1992) Sperm morphology in the Pterastericolidae (Platyhelminthes, Rhabdocoela): phylogenetic implications. Zool Scr 21:223–230Google Scholar
  14. Justine J-L (1991 a) Cladistic study in the Monogenea (Platyhelminthes), based upon a parsimony analysis of spermiogenetic and spermatozoal characters. Int J Parasitol 21:821–838Google Scholar
  15. Justine J-L (1991b) Phylogeny of parasitic Platyhelminthes: a critical study of synapomorphies proposed from the ultrastructure of spermiogenesis and spermatozoa. Can J Zool 69:1421–1440Google Scholar
  16. Justine J-L, Lambert A, Mattei X (1985) Spermatozoon ultrastructure and phylogenetic relationships in the monogeneans (Platyhelminthes). Int J Parasitol 15:601–608Google Scholar
  17. L'Hardy J-P (1988) Sperm morphology in Kalyptorhynchia (Platyhelminthes, Rhabdocoela). Fortschr Zool 36:303–307Google Scholar
  18. Li MM, Watson NA, Rohde K (1992) Ultrastructure of sperm and spermatogenesis ofArtioposthia sp. (Platyhelminthes, Tricladida, Terricola). Aust J Zool 40:667–674Google Scholar
  19. Noury-Sraïri N, Justine J-L, Euzet L (1989) Implications phylogénétiques de l'ultrastructure de la spermiogenèse, du spermatozoïde et de l'ovogenèse du turbellariéurastoma cyprinae (“Prolecithophora”, Urastomidae). Zool Scr 18:175–185Google Scholar
  20. Rohde K (1990) Phylogeny of Platyhelminthes, with special reference to parasitic groups. Int J Parasitol 20:979–1007Google Scholar
  21. Rohde K (1991) The evolution of protonephridia of the Platyhelminthes. Hydrobiologia 227:315–321Google Scholar
  22. Rohde K, Watson NA (1993) Ultrastructure of spermiogenesis and sperm of an undescribed species of Luridae (Platyhelminthes, Rhabdocoela). Aust J Zool (in press)Google Scholar
  23. Rohde K, Watson N, Cannon LRG (1988) Ultrastructure of spermiogenesis inAmphiscolops (Acoela, Convolutidae) and of sperm ofPseudactinoposthia (Acoela, Childiidae). J Submicrosc Cytol Pathol 20:595–604Google Scholar
  24. Rohde K, Watson NA, Jondelius U (1992) Ultrastructure of the protonephridia ofSyndisyrinx punicea (Hickman 1956) (Rhabdocoela, Umagillidae) andPterastericola pellucida (Jondelius 1989) (Rhabdocoela, Pterastericolidae). Aust J Zool 40:385–399Google Scholar
  25. Rohde K, Hefford C, Ellis J, Johnson AM, Baverstock PR, Watson NA, Dittmann S (1993) Contributions to the phylogeny of Playtyhelminthes based on partial sequencing of 18S ribosomal DNA. Int J Parasitol (in press)Google Scholar
  26. Watson NA, Rohde K (1992) Ultrastructure of sperm and spermatogenesis ofAnoplodiscus cirrusspiralis (Monogenea, Monopisthocotylea). Ann Parasitol Hum Comp 67:131–140Google Scholar
  27. Xylander WER (1989) Ultrastructural studies on the reproductive system of Gyrocotylidea and Amphilinidea (Cestoda): spermatogenesis, spermatozoa, testis and vas deferens ofGryocotyle. Int J Parasitol 19:897–905Google Scholar

Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • N. A. Watson
    • 1
  • K. Rohde
    • 1
  • U. Jondelius
    • 2
  1. 1.Department of ZoologyUniversity of New EnglandArmidaleAustralia
  2. 2.Department of ZoologyUniversity of GöteborgGöteborgSweden

Personalised recommendations