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Heteromorphic sex chromosomes inEupsophus insularis (Amphibia: Anura: Leptodactylidae)

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Abstract

The chromosomes of the Chilean frogEupsophus insularis are described for the first time. This species has a chromosome number of 2n=30, and based on the karyotype it is concluded thatE. insularis is closely related toE. migueli. E. insularis has an XX/XY system of sex determination, and pericentromeric constitutive heterochromatin is present in all chromosomes except in the Y chromosome. It is postulated that the Y chromosome is derived from a small ancestral metacentric chromosome that lost its heterochromatic segment.

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Authors and Affiliations

  1. Institute of Zoology, Universidad Austral de Chile, Casilla 567, Valdivia, Chile

    C. C. Cuevas & J. R. Formas

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  1. C. C. Cuevas
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  2. J. R. Formas
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accepted for publication by M. Schmid

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Cuevas, C.C., Formas, J.R. Heteromorphic sex chromosomes inEupsophus insularis (Amphibia: Anura: Leptodactylidae). Chromosome Res 4, 467–470 (1996). https://doi.org/10.1007/BF02265054

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  • DOI: https://doi.org/10.1007/BF02265054

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