Sperm ultrastructure of the Actinocyclidae (Mollusca, Nudibranchia) and homology of the terminal region of nudibranch sperm

Wilson, N. G. (2005) Sperm ultrastructure of the Actinocyclidae (Mollusca, Nudibranchia) and homology of the terminal region of nudibranch sperm. Invertebrate Reproduction & Development, 47 1: 1-9. doi:10.1080/07924259.2005.9652141


Author Wilson, N. G.
Title Sperm ultrastructure of the Actinocyclidae (Mollusca, Nudibranchia) and homology of the terminal region of nudibranch sperm
Journal name Invertebrate Reproduction & Development   Check publisher's open access policy
ISSN 0792-4259
Publication date 2005-01-01
Sub-type Article (original research)
DOI 10.1080/07924259.2005.9652141
Volume 47
Issue 1
Start page 1
End page 9
Total pages 9
Editor Hans Laufer
Place of publication Rehovot, Israel
Publisher Int Science Services/Balaban Publishers
Collection year 2005
Language eng
Subject C1
270500 Zoology
780108 Behavioural and cognitive sciences
Abstract Sperm ultrastructure is examined and described for the actinocyclidid nudibranchs Actinocyclus verrucosus, Hallaxa iju and Hallaxa indecora. Although general characteristics were consistent with previously described heterobranch observations, present investigations revealed ultrastructural synapomorphies for the family based on the morphology of the terminal region of the spermatozoon. In actinocyclidids, the axonemal microtubules penetrate for some distance beyond the annulus, and the annular accessory body elongates to completely seal the terminal region. Chromodoris also has an annular accessory body that completely seals the axoneme and terminal region, but it does not extend far beyond the annulus, and it is possible that these states were derived independently. Cytochemical staining confirmed that there was no glycogen present in the posterior region of the sperm for H. indecora or Chromodoris kuniei. However, representatives of other chromodoridid genera (Noumea, Risbecia) have an axoneme that penetrates through the entire annular complex, after which it is sheathed by a glycogen deposit. Similarities in the acrosomal complex support the proposed sister group relationship between the Actinocyclidae and Chromodorididae.
Keyword Reproductive Biology
Zoology
Opisthobranchia
Spermatozoa
Glycogen Staining
Chromodorididae
Hypselodoris-tricolor Gastropoda
Dorids Mollusca
Genus
Pacific
Phylogeny
Genera
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2006 Higher Education Research Data Collection
School of Biological Sciences Publications
 
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Created: Wed, 15 Aug 2007, 17:45:47 EST