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- Title
EUSPERMATOZOAN ULTRASTRUCTURE IN BEMBICIUM AURATUM (GASTROPODA): COMPARISON WITH OTHER CAENOGASTROPODS ESPECIALLY OTHER LITTORINIDAE.
- Authors
HEALY, JOHN M
- Abstract
Euspermatozoa of Bembicium auratum Quoy & Gaimard are examined ultrastructurally and compared with euspermatozoa of other caeno-gastropods, especially other species of Littonnidae The acrosomal vesicle is conical, deeply invaginated (accommodating an axial rod) and exhibits radial plates and a weakly developed apical bleb. Unlike euspermatozoa of the Littonmnae which have a long tubular nucleus (sheathing a significant portion of the axoneme), the eusperm nucleus of B. auratum is short, rod-shaped and solid with the exception of a shallow centriolar fossa posteriorly Available evidence suggests this is also the case for other species of Lacuninae and for the Laevilitonninae The eusperm midpiece of B auratum consists of the axoneme and 7–9 helically arranged mitochondria (containing short, randomly arranged cnstae) Immediately posterior to the annulus, the axoneme is surrounded by nine tracts of glycogen granules to form the glycogen piece. The euspermatozoon terminates in a short end piece, in which the 9+2 axoneme degenerates into isolated microtubules, only two of which survive to the posterior extremity of the cell Paraspermatozoa have not been observed in any species of Bembicium or in fact any other species of the Lacuninae, suggesting that absence of paraspermatozoa is characteristic of the subfamily (contrasting with well developed round paraspermatozoa of the Littonninae)
- Subjects
GASTROPODA; ULTRASTRUCTURE (Biology); LITTORINIDAE; CELL nuclei; AXONEMES; MITOCHONDRIA; GLYCOGEN; NEOGASTROPODA
- Publication
Journal of Molluscan Studies, 1996, Vol 62, Issue 1, p57
- ISSN
0260-1230
- Publication type
Article
- DOI
10.1093/mollus/62.1.57