Spermatoza and spermiogenesis of Cornirostra, Valvata and Orbitestella (gastropoda: Heterobranchia) witg a discussion of valvatoidean sperm morphology

Healy J.M. (1990) Spermatoza and spermiogenesis of Cornirostra, Valvata and Orbitestella (gastropoda: Heterobranchia) witg a discussion of valvatoidean sperm morphology. Journal of Molluscan Studies, 56 4: 557-566. doi:10.1093/mollus/56.4.557


Author Healy J.M.
Title Spermatoza and spermiogenesis of Cornirostra, Valvata and Orbitestella (gastropoda: Heterobranchia) witg a discussion of valvatoidean sperm morphology
Journal name Journal of Molluscan Studies   Check publisher's open access policy
ISSN 0260-1230
Publication date 1990-01-01
Sub-type Article (original research)
DOI 10.1093/mollus/56.4.557
Volume 56
Issue 4
Start page 557
End page 566
Total pages 10
Subject 1804 Statistics, Probability and Uncertainty
2604 Applied Mathematics
2303 Ecology
1105 Dentistry
1103 Clinical Sciences
1104 Complementary and Alternative Medicine
Abstract Transmission electron microscopy reveals that spermatozoa of the marine gastropods Cornirostra peleucida (Laseron) (Cornirostridate-genus and family newly proposed by Ponder, 1990a) and Orbitestella sp. (Orbitestellidae) closely resemble those of the freshwater family valvatidae. In particular, spermatozoa of Cornirostra, Orbitestella and Valvata share a unique arrangement of helical ridges or channels within the glycogen piece. The sperm midpiece of Orbitestella and Valvata has a lamellar substructure, while in Cornirostra thus region exhibits a single, continuous mitochondrial sheath around the axoneme. An acrosome could not be positively identified in either Valvata or Orbitestella but appears to be present in Cornirostra in the form of a hollow, irregular vesicle. Mature sperm nuclei of the three taxa are long, filiform and almost totally penetrated by the axoneme. Nuclei of Orbitestella possess one or more helical keels (keels absent in Cornirostra and Valvata). The pattern of spermiogenesis observed suports the view expressed by recent authors that the Valvatoidea are closely related to heterobrach gastropods, and should be formally transferred to the Heterobranchia.
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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