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The ultrastructure of the spermatozoon of Lernaeocera branchialis (Copepoda: Pennellidae)
Grant, H.J.; Whitfield, P.J. (1988). The ultrastructure of the spermatozoon of Lernaeocera branchialis (Copepoda: Pennellidae), in: Boxshall, G.A. et al. Biology of copepods: Proceedings of the third international conference on Copepoda. Developments in Hydrobiology, 47: pp. 597-605. http://dx.doi.org/10.1007/978-94-009-3103-9_70
In: Boxshall, G.A.; Schminke, H.K. (Ed.) (1988). Biology of copepods: Proceedings of the third international conference on Copepoda. Developments in Hydrobiology, 47. Kluwer Academic Publishers: Dordrecht/Boston/London. ISBN 978-94-010-7895-5; e-ISBN 978-94-009-3103-9. XII, 639 pp. https://dx.doi.org/10.1007/978-94-009-3103-9, more
In: Dumont, H.J. (Ed.) Developments in Hydrobiology. Kluwer Academic/Springer: The Hague; London; Boston; Dordrecht. ISSN 0167-8418, more
Keywords
    Ultrastructure
    Copepoda [WoRMS]; Lernaeocera branchialis (Linnaeus, 1767) [WoRMS]
    Marine/Coastal
Author keywords
    Spermatozoon
Authors  Top 
  • Grant, H.J.
  • Whitfield, P.J.
Abstract
    Spermatozoa are produced by males of the fish-parasitic copepod, Lernaeocera branchialis, on the flounder (Platichthysflesus) host and packaged into spermatophores. Mature spermatozoa from spermatophores have been investigated with light microscopy and t.e.m. and s.e.m. techniques. Each is a filiform cell up to 30 µm long and 1 µm in diameter. being symmetrically tapered at each end to produce a ‘javelin-shaped’ configuration. Surface s.e.m. appearances suggest that the cell is helically twisted. The spermatozoon possesses no flagellum, no nuclear envelope, no mitochondria and no orthodox acrosome. For most of its length the cell has a four-lobed appearance in transverse section and contains little more than a cylindrical sleeve of pseudomembranous material with which is associated finely filamentous or granular material which is assumed to be nuclear chromatin. The spermatozoon is immobile in seawater.

    The ultrastructure of L. branchialis spermatozoa has been compared with that of eight other copepod species

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