Ultrastructure of paraspermatozoa, euspermatozoa and eusperm-like spermatozoa of Obtortio cf. fulva (Prosobranchia: Cerithiacea)

Healy J.M. (1982) Ultrastructure of paraspermatozoa, euspermatozoa and eusperm-like spermatozoa of Obtortio cf. fulva (Prosobranchia: Cerithiacea). Helgoländer Meeresuntersuchungen, 35 4: 489-500. doi:10.1007/BF01999137


Author Healy J.M.
Title Ultrastructure of paraspermatozoa, euspermatozoa and eusperm-like spermatozoa of Obtortio cf. fulva (Prosobranchia: Cerithiacea)
Journal name Helgoländer Meeresuntersuchungen   Check publisher's open access policy
ISSN 0174-3597
Publication date 1982-01-01
Sub-type Article (original research)
DOI 10.1007/BF01999137
Volume 35
Issue 4
Start page 489
End page 500
Total pages 12
Publisher Springer-Verlag
Subject 2300 Environmental Science
1900 Earth and Planetary Sciences
Abstract The cerithiacean Obtortio cf. fulva produces three distinct types of spermatozoa: (1) paraspermatozoa, (2) euspermatozoa and (3) eusperm-like spermatozoa. Like most mesogastropods, euspermatozoa of Obtortio are composed of a conical acrosome, short posteriorly invaginated nucleus, elongate midpiece and glycogen piece, and short terminal region. The midpiece, however, is distinctly cerithiacean in structure and is composed of four non-helical midpiece elements. Eusperm-like spermatozoa closely resemble euspermatozoa, but have a very short nucleus only one half to one third the length of the euspermatozoon nucleus. Paraspermatozoa of this species are composed of (1) "head" (mosaic sheath of dense blocks enveloping multiple axonemes which attach anteriorly to a long apical structure), (2) "midpiece" (multiple axonemes interspersed with elongate mitochondria), and (3) multiple tail tuft (axonemes each ensheathed by glycogen granules). The possible role of eusperm-like spermatozoa is briefly discussed together with the taxonomic implications of the structure of the three sperm types.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

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