Is Cadinella ornatissima a chomodorid? Sperm ultra structure in an enigmatic nudibranch (Opisthobranchia Mollusca)

Wilson, N. G. (2002) Is Cadinella ornatissima a chomodorid? Sperm ultra structure in an enigmatic nudibranch (Opisthobranchia Mollusca). Invertebrate Reproduction and Development, 42 2-3: 179-188. doi:10.1080/07924259.2002.9652774


Author Wilson, N. G.
Title Is Cadinella ornatissima a chomodorid? Sperm ultra structure in an enigmatic nudibranch (Opisthobranchia Mollusca)
Journal name Invertebrate Reproduction and Development
ISSN 0168-8170
Publication date 2002-09
Sub-type Article (original research)
DOI 10.1080/07924259.2002.9652774
Volume 42
Issue 2-3
Start page 179
End page 188
Total pages 10
Editor David Golding
Place of publication Philadelphia, P.A., U.S.A.
Publisher Balaban/ Rehovot
Collection year 2002
Language eng
Subject C1
270504 Invertebrate Biology
770403 Living resources (flora and fauna)
Abstract Sperm ultrastructure is described for the nudibranch gastropod Cadlinella ornatissima, type species of the genus Cadlinella (Thiele). Although C. ornatissima exhibits most of the sperm features characteristic of other Opisthobranchia and the Pulmonata (a small, rounded acrosomal vesicle, a complex, helical, mitochondrial derivative - partially paracrystalline, coarse fibres associated with the axoneme), it also possesses a number of previously undescribed and possibly unique features (a longitudinally inrolled acrosomal pedestal, an axial structure within the cavity of the acrosomal pedestal, an electron-dense collar at the anterior region of the acrosomal pedestal, the presence of crystalloid bodies within the glycogen helices of the mitochondrial derivative). To our knowledge this is the first report of crystalloid bodies in mature sperm of any mollusc. Collectively this evidence raises questions concerning the affinities and systematic position of Cadlinella within the Nudibranchia. The peculiar nature of the sperm differences, in comparison with other investigated nudibranchs, suggest that Cadlinella is not easily linked to either the Cadlinidae or Chromodorididae, and should be considered incertae sedis.
Keyword Chromodorididae
Crystalloids
Gastropoda
Phylogeny
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Marine Studies Publications
 
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Created: Tue, 14 Aug 2007, 18:48:27 EST