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Chromosomes of Australian lygosomine skinks (Lacertilia: Scincidae)

I. The egermia group: C-banding, silver staining, hoechst 33258 condensation analysis

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Abstract

The karyotypes of 25 species from the scincid genera Egernia, Corucia and Tiliqua have been investigated using C-banding, silver staining of nucleolar organiser regions (NORs) and Hoechst 33258 induced condensation inhibition. At least one member from each of the species groups of Egernia recognised by Storr et al. (1981) was studied. The three genera have very similar conventionally stained karyotypes of 32 chromosomes. Some species show departures from this basic karyotype but these are due to additions of C-band positive material. Silver stained. NOR patterns are variable but most species have a silver staining site on a pair of larger microchromosomes. All specimens studied except one have a proximal C-band on the acrocentric ninth pair, which shows failure to condense following treatment with the fluorochrome Hoechst 33258. Heterogamety was not observed in any species. Mabuya multifasciata, proposed as a relative of the Egernia group, while having 32 chromosomes does not share the C-band marker on pair nine, unique to the Egernia group. Tribolonotus gracilis, sometimes allied with the Egernia group, has 32 chromosomes and a similiar karyotype, but prominent procentric C-bands on all chromosome pairs obscure the detection of the proximal C-band marker on pair nine.

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  1. S. C. Donnellan

    Present address: Evolutionary Biology Unit, South Australian Museum, 5000, Adelaide, South Australia, Australia

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  1. School of Biological Sciences, Macquarie University, 2113, New South Wales, Australia

    S. C. Donnellan

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Donnellan, S.C. Chromosomes of Australian lygosomine skinks (Lacertilia: Scincidae). Genetica 83, 207–222 (1991). https://doi.org/10.1007/BF00126227

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  • DOI: https://doi.org/10.1007/BF00126227

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