An ultrastructural study of euspermatozoa, paraspermatozoa and nurse cells of the cowrie Cypraea errones (gastropoda, prosobranchia, cypraeidae)

Healy J.M. (1986) An ultrastructural study of euspermatozoa, paraspermatozoa and nurse cells of the cowrie Cypraea errones (gastropoda, prosobranchia, cypraeidae). Journal of Molluscan Studies, 52 2: 125-137. doi:10.1093/mollus/52.2.125


Author Healy J.M.
Title An ultrastructural study of euspermatozoa, paraspermatozoa and nurse cells of the cowrie Cypraea errones (gastropoda, prosobranchia, cypraeidae)
Journal name Journal of Molluscan Studies   Check publisher's open access policy
ISSN 0260-1230
Publication date 1986-07-30
Sub-type Article (original research)
DOI 10.1093/mollus/52.2.125
Volume 52
Issue 2
Start page 125
End page 137
Total pages 13
Subject 1804 Statistics, Probability and Uncertainty
2604 Applied Mathematics
2303 Ecology
1105 Dentistry
1103 Clinical Sciences
1104 Complementary and Alternative Medicine
Abstract The sperm duct of the cowrie Cypraea errones Linné contains euspermatozoa, paraspermatozoa and nurse celts, the latter bearing clumps of attached euspermatozoa. Nurse cell/euspermatozoa associations have been described in certain littorinacean gastropods, but are previously unrecorded in the Cypraeacea. Euspermatozoa of C. errones resemble those of many other mesogastropods and some neogastropods (for example members of the Strombidae, Epitoniidae, Naticidae, Volutidae; shared features include structure of the acrosome, nucleus, glycogen piece, and helically coiled midpiece elements). However in C. errones, radially arranged paracrystalline fibres partly occupy the space between adjacent midpiece elements. Paracrystalline material is only rarely observed in spermatozoa of prosobranch gastropods and in all cases (including C. errones), is readily discernible form the complex paracrystalline layers present in the mitochondria) derivative of opisthobranch and pulmonate spermatozoa. Paraspermatozoa of C. errones are elongate, vermiform cells containing: multiple axonemes (bunched anteriorly, peripherally distributed posteriorly); granulated deposits (anteriorly); numerous dense vesicles (posteriorly) and scattered mitochondria (elongate, with parallel cristae). The axonemal attachment complexes fuse apically to form a sharp, conical structure. Comparison with available electron microscopic and light microscopic accounts of prosobranch euspermatozoa and paraspermatozoa suggests close ties between the higher Mesogastropoda (with which the Cypraeidae should be included) and the Neogastropoda. Further research will be required to determine whether the paracrystalline fibres observed in euspermatozoa of C. errones are characteristic of the Cypraeidae or perhaps shared with the Ovulidae or Triviidae.
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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