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1 January 2010 Differentiation and Development of Gonads in the Yellow-Bellied Toad, Bombina variegata L., 1758 (Amphibia: Anura: Bombinatoridae)
Rafał P. Piprek, Anna Pecio, Jacek M. Szymura
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The aim of this study was to investigate consecutive stages of gonadal development of the yellow-bellied toad (Bombina variegata) with particular emphasis on the origin of somatic and germ cell lineages as well as the timing of gonial cell migration. Changes in gonadal basal lamina distribution helped to explain the exceptional mode of gonadal differentiation in this species. Atypical and rapid differentiation of the male gonad in B. variegata is the result of the ability of gonial cells to migrate into the center of the gonad relatively early. Thus, the testis medulla contains germ cells from the onset of gonadal differentiation into cortex and medulla, whereas in other anurans a sterile medulla is characteristic of both future testes and ovaries; germ cells translocate into the medulla during the subsequent stage of testis development. This atypical testiculogenesis is probably the result of an acceleration of the sex determination period, indicating a contribution of sex determination heterochrony to the course of gonadogenesis. The results also suggest that medullar cells are derived from proliferating coelomic epithelial cells. Moreover, Sertoli cells constitute an integral part of the germinal epithelium in B. variegata, as in other vertebrates. Spermatids do not contact Sertoli cells just before spermiation and do not form bundles.

© 2010 Zoological Society of Japan
Rafał P. Piprek, Anna Pecio, and Jacek M. Szymura "Differentiation and Development of Gonads in the Yellow-Bellied Toad, Bombina variegata L., 1758 (Amphibia: Anura: Bombinatoridae)," Zoological Science 27(1), 47-55, (1 January 2010).
Received: 25 June 2009; Accepted: 23 September 2009; Published: 1 January 2010
gonadal development
gonadal somatic cells
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