Journalartikel

Jahr der Veröffentlichung: 1980

Seiten: 289-294

Zeitschrift: Cell and Tissue Research

Bandnummer: 205

Heftnummer: 2

ISSN: 0302-766X

eISSN: 1432-0878

Verlag: 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.

Harvard-Zitierstil: 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-Zitierstil: 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.