Measures of genetic differentiation and diversity were used in two complementary analyses. On 41 islands and 4 mainland locations in a remote area of Australia, we genotyped individuals across 18 nuclear (microsatellite) markers. We used the ubiquitous bar-shouldered skink (Ctenotus inornatus) as a model species to represent the influence of landscape factors on genetic structure across the Kimberley islands. It is therefore of great interest for managers to understand the driving forces of genetic structure of species within these island archipelagos. The Kimberley region of northwestern Australia has more than 2500 islands that have recently come into focus as substantial conservation resources. Islands present a unique scenario in conservation biology, offering refuge yet imposing limitations on insular populations. nana complex, although further analyses of species lim-its among the remaining mostly parapatric lineages of G. Our revision largely stabilises the taxonomy of the G. nov., a small-bodied form with granules on the proximal lamellae from the north-west and southern Kimberley ranges and the small-bodied G. from the western Northern Territory, the large-bodied G. The new species are phylogenetically divergent and morphologically diagnosable, and include the rel-atively cryptic G. We describe four new species with more restricted distributions within the G. nana as a widespread taxon with complex genetic structure across the Kimberley of Western Australia and Top End of the Northern Territory, including a lineage with mtDNA intro-gressed from the larger-bodied G. Here we use an integrated approach to ex-plore species delimitation in this complex. nana are phenotypically distinct, while others are highly conservative morphologically. Several of these lineages currently included in G. A recent phylogenomic analysis re-vealed eight deeply divergent lineages that occur as a series of overlapping distributions across the AMT and which, as a whole, are paraphyletic with four previously described species. Recent advances in molecular genetic techniques and increased fine scale sampling in the Australian Monsoonal Tropics (AMT) have provided new impetus to reassess species boundaries in the Gehyra nana species complex, a clade of small-bodied, saxicolous geckos which are widely distributed across northern Australia.
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