Spermatozoan ultrastructure in the trigonioid bivalve neotrigonia margaritacea Lamarck (Mollusca): Comparison with other bivalves, especially trigonioida and unionoida

Healy J.M. (1996) Spermatozoan ultrastructure in the trigonioid bivalve neotrigonia margaritacea Lamarck (Mollusca): Comparison with other bivalves, especially trigonioida and unionoida. Helgolander Meeresuntersuchungen, 50 2: 259-264.

Author Healy J.M.
Title Spermatozoan ultrastructure in the trigonioid bivalve neotrigonia margaritacea Lamarck (Mollusca): Comparison with other bivalves, especially trigonioida and unionoida
Journal name Helgolander Meeresuntersuchungen   Check publisher's open access policy
ISSN 0174-3597
Publication date 1996-01-01
Sub-type Article (original research)
Open Access Status Not yet assessed
Volume 50
Issue 2
Start page 259
End page 264
Total pages 254
Subject 2300 Environmental Science
1900 Earth and Planetary Sciences
1104 Complementary and Alternative Medicine
1910 Oceanography
Abstract Spermatozoa of the trigonioid bivalve Neotrigonia margaritacea (Lamarck) (Trigoniidae, Trigonioida) are examined ultrastructurally. A cluster of discoidal, proacrosomal vesicles (between 9 to 15 in number) constitutes the acrosomal complex at the nuclear apex. The nucleus is short (2.4-2.6 μm long, maximum diameter 2.2 μm), blunt-conical in shape, and exhibits irregular lacunae within its contents. Five or sometimes four round mitochondria are impressed into shallow depressions in the base of the nucleus as is a discrete centriolar fossa. The mitochondria surround two orthogonally arranged centrioles to form, collectively, the midpiece region. The distal centriole, anchored by nine satellite fibres to the plasma membrane, acts as a basal body to the sperm flagellum. The presence of numerous proacrosomal vesicles instead of a single, conical acrosomal vesicle sets Neotrigonia (and the Trigonioida) apart from other bivalves, with the exception of the Unionoida which are also known to exhibit this multivesicular condition. Spermatozoa of N. margaritacea are very similar to those of the related species Neotrigonia bednalli (Verco) with the exception that the proacrosomal vesicles of N. margaritacea are noticeably larger than those of N. bednalli.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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