Sexual differentiation traits in functional males with female genital apertures (male symbol fga) in the woodlice Armadillidium vulgare Latr. (Isopoda, Crustacea)

General and Comparative Endocrinology
Atf AzzounaGilbert Martin

Abstract

This study reports the results of examination of the gonadal morphology and ultrastructural features of the androgenic hormone (AH)-producing androgenic gland cells of laboratory stocks of functional male woodlice, Armadillidium vulgare, with female genital apertures ( male symbol fga), with and without experimentally induced infections of the sex-ratio-distorting endobacterial parasite, Wolbachia. Males ( male symbol fga) have been reported in wild populations containing individuals infected with this maternally transmitted sex-ratio-distorting parasite. We report a reduction of testicular segment (utricle) number, androgenic gland cell hypertrophy, and electron-dense ultrastructural cytological features in male symbol fga males. The presence of the Wolbachia parasite had no effect on the features we examined. These results suggest that male symbol fga males are produced as the result of a delayed expression/action of the male sex-determining AH which causes a "lag-phase" delay in male differentiation in genetic males and is not due to the presence, in genetic females, of a hypothetical, epigenetic "M" gene as suggested by Rigaud and Juchault. Our results favor the interpretation of males as true genetic (ZZ) males in which th...Continue Reading

References

Nov 23, 1992·Proceedings. Biological Sciences·F RoussetM Solignac
Oct 26, 1999·Biochemical and Biophysical Research Communications·A OkunoH Nagasawa
Dec 10, 1999·Proceedings of the National Academy of Sciences of the United States of America·E D SegalL S Tompkins
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Oct 1, 1964·General and Comparative Endocrinology·D S KING
Apr 15, 2004·General and Comparative Endocrinology·Pierre GrèveGilbert Martin
Jan 1, 1984·Genetics, Selection, Evolution : GSE·J J LegrandC Le Bote

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Citations

Jan 13, 2015·Journal of Morphology·Anirban BanerjeeSamar Kumar Saha
Mar 14, 2009·Comptes rendus biologies·Hervé Merçot, Denis Poinsot

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