liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Sperm morphology of the Eurasian beaver, Castor fiber: An example of a species of rodent with highly derived and pleiomorphic sperm populations
Warsaw Agricultural University, Warsaw, Poland.
Polish Academy of Sciences, Olsztyn, Poland.
The University of Adelaide, SA 5005, Australia.
Swedish University of Agricultural Sciences, Uppsala S-75007, Sweden.
Show others and affiliations
2007 (English)In: Journal of morphology (1931. Print), ISSN 0362-2525, E-ISSN 1097-4687, Vol. 268, no 8, 683-689 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Wiley-Blackwell , 2007. Vol. 268, no 8, 683-689 p.
Keyword [en]
sperm morphology; beaver; sciurognath rodent
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-101771DOI: 10.1002/jmor.10544ISI: 000248630400003OAI: diva2:666686
Available from: 2013-11-23 Created: 2013-11-22 Last updated: 2015-03-12

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Rodriguez-Martinez, Heriberto
In the same journal
Journal of morphology (1931. Print)
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 64 hits
ReferencesLink to record
Permanent link

Direct link