Rodriguez, Heriberto
- Department of Clinical Sciences, Swedish University of Agricultural Sciences
Abstract
The structural organization of the spermatozoon from the Eurasian beaver, Castor fiber (Family: Castoridae), was determined and compared to that of other sciuromorph rodents. The beaver spermatozoon has a head, which is variable in form but usually paddle-shaped, with a small nucleus and very large acrosome, and a tail that is relatively short compared to that of most other rodents. Transmission electron microscopy indicates that in most testicular spermatozoa the acrosome projects apically, although in a few it becomes partly flexed. During the final stages of maturation, however, the acrosome becomes highly folded so that the apical segment comes to lie alongside part of the acrosome that occurs lateral to the nucleus, with, in some cases, fusion taking place between the outer acrosomal membranes. The sperm nucleus is wedge-shaped, being broader basally and narrowing apically with an occasional large nuclear vacuole occurring. This spermatozoon structure is markedly different from that found in the other species of Geomyoidea, which is the sister group of the Castoridae. The findings thus emphasize the highly divergent nature of the beaver spermatozoon and demonstrate that, within the proposed Infraorder Castorimorpha, very large differences in sperm structure have evolved
Published in
Journal of Morphology
2007, volume: 268, number: 8, pages: 683-689
Publisher: WILEY-LISS
SLU Authors
UKÄ Subject classification
Environmental Sciences and Nature Conservation
Veterinary Science
Animal and Dairy Science
Publication identifier
- DOI: https://doi.org/10.1002/jmor.10544
Permanent link to this page (URI)
https://res.slu.se/id/publ/16578