Euspermatozoan ultrastructure in Bembicium auratum (Gastropoda): Comparison with other caenogastropods especially other littorinidae

Healy J.M. (1996) Euspermatozoan ultrastructure in Bembicium auratum (Gastropoda): Comparison with other caenogastropods especially other littorinidae. Journal of Molluscan Studies, 62 1: 57-63.

Author Healy J.M.
Title Euspermatozoan ultrastructure in Bembicium auratum (Gastropoda): Comparison with other caenogastropods especially other littorinidae
Journal name Journal of Molluscan Studies   Check publisher's open access policy
ISSN 0260-1230
Publication date 1996-01-01
Sub-type Critical review of research, literature review, critical commentary
Open Access Status Not yet assessed
Volume 62
Issue 1
Start page 57
End page 63
Total pages 7
Language eng
Subject 1103 Clinical Sciences
1104 Complementary and Alternative Medicine
Abstract Euspermatozoa of Bembicium auratum Quoy & Gaimard are examined ultrastructurally and compared with euspermatozoa of other caenogastropods, especially other species of Littorinidae. 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 Littorininae 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 Laevilitorininae. The eusperm midpiece of B. auratum consists of the axoneme and 7-9 helically arranged mitochondria (containing short, randomly arranged cristae). 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 Littorininae).
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
Collection: Scopus Import - Archived
 
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