Bibliographic Details
| Title: |
Ultrastructure of Thunnus thynnus and Euthynnus alletteratus spermatozoa |
| Authors: |
Abascal, F. J.1, Medina, A.1, Megina, C.1, Calzada, A.1 |
| Source: |
Journal of Fish Biology. Jan2002, Vol. 60 Issue 1, p147. 7p. |
| Subjects: |
Spermatozoa, Bluefin tuna, Euthynnus alletteratus |
| Abstract: |
The spermatozoa of Thunnus thynnus and Euthynnus alletteratus consist of an acrosome-less head (comprising the ovoid nucleus and the short midpiece) and a long flagellar tail that contains the conventional 9+2 axoneme and lacks lateral fins. The centrioles are arranged at approximately right angles and lie outside of a shallow nuclear groove. The flagellum inserts laterally on the nucleus, therefore the spermatozoon is asymmetrical. The midpiece contains a few mitochondria which are separated from the axoneme by the cytoplasmic canal; they are spherical in T. thynnus and elongate, somewhat irregular in E. alletteratus. Although the main ultrastructural characteristics of the spermatozoa appear to indicate a great homogeneity in the sperm morphology within the family Scombridae, small species-specific divergences may be of use in systematics. [Copyright &y& Elsevier] |
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| Database: |
Engineering Source |
