Journal article

OCCURRENCE OF SPERMATOZOA IN THE OVARY OF NULLIPAROUS FEMALES OF HETERANDRIA-FORMOSA AGASSIZ, 1853 (PISCES, POECILIIDAE)


Authors list: RIEHL, R

Publication year: 1980

Pages: 289-294

Journal: Cell and Tissue Research

Volume number: 205

Issue number: 2

ISSN: 0302-766X

eISSN: 1432-0878

Publisher: Springer


Abstract: 
The ovaries of more than 100 adult nulliparous females of the poeciliid H. formosa were investigated by light microscopy and EM. Among these females, 2 hermaphroditic specimens were found. The gonads of the hermaphrodites do not differ externally from those of normal females. In semithin and ultrathin sections, female and male parts of the gonad can be distinguished. The female parts are very dominant. The oocytes of the hermaphroditic gonads are in the stage of vitellogenesis. They are enveloped by a thin zona radiata. The heads of completely developed spermatozoa are aligned horseshoe-shaped. Oocytes and spermatozoa adjoin each other directly. H. formosa is the only known abnormal hermaphroditic species of fish in which spermatozoa and mature eggs occur simultaneously in the gonad.



Citation Styles

Harvard Citation style: RIEHL, R. (1980) OCCURRENCE OF SPERMATOZOA IN THE OVARY OF NULLIPAROUS FEMALES OF HETERANDRIA-FORMOSA AGASSIZ, 1853 (PISCES, POECILIIDAE), Cell and Tissue Research, 205(2), pp. 289-294

APA Citation style: RIEHL, R. (1980). OCCURRENCE OF SPERMATOZOA IN THE OVARY OF NULLIPAROUS FEMALES OF HETERANDRIA-FORMOSA AGASSIZ, 1853 (PISCES, POECILIIDAE). Cell and Tissue Research. 205(2), 289-294.


Last updated on 2025-02-04 at 05:36