Document Detail

New ultrastructural aspects of the spermatozoon of Aplysia depilans (Gastropoda, Opisthobranchia).
MedLine Citation:
PMID:  11686398     Owner:  NLM     Status:  MEDLINE    
The spermatozoon of the sea hare Aplysia depilans was studied under scanning (SEM) and transmission electron microscopy (TEM). Previous descriptions of this sperm and related species, both from light and electron microscopy, were inconsistent with each other. These descriptions include A. depilans, A. punctata, A. fasciata, A. kurodai and Bursatella leachiplei. Several detailed micrographs provide a new ultrastructural model and reveal new aspects such as the presence of acrosome and the absence of a glycogen piece, therefore the modified dense ring is the terminal structure. Results also show that previous models are incorrect in many aspects. The spermatozoon is a long slender uniflagellated cell with a complex helical structure and a length of approximately 165 microm. Observed in SEM the spermatozoon has an undifferentiated head and tail. The nucleus is cord-shaped and helically intertwined with the axoneme/mitochondrial derivative complex. The mitochondrial derivative has only one glycogen helix. Glycogen presence was demonstrated by Thiéry's method. Typical heterobranchia spermatozoa features are recognised. From bibliographic analysis, a high degree of similarity was found with the sperm of Pleurobranchea maculata (Notaspidea).
P Vita; L Corral; C Azevedo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of submicroscopic cytology and pathology     Volume:  33     ISSN:  1122-9497     ISO Abbreviation:  J. Submicrosc. Cytol. Pathol.     Publication Date:    2001 Jan-Apr
Date Detail:
Created Date:  2001-10-31     Completed Date:  2002-03-13     Revised Date:  2009-11-03    
Medline Journal Info:
Nlm Unique ID:  8804312     Medline TA:  J Submicrosc Cytol Pathol     Country:  Italy    
Other Details:
Languages:  eng     Pagination:  165-71     Citation Subset:  IM    
Department of Cell Biology, Institute of Biomedical Sciences, and Center of Marine and Environmental Research, University of Oporto, Portugal.
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MeSH Terms
Acrosome / ultrastructure
Aplysia / physiology,  ultrastructure*
Cell Nucleus / ultrastructure
Microscopy, Electron, Scanning
Organelles / ultrastructure
Spermatozoa / ultrastructure*

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