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Hybridization between distinct species of animals and subsequent genetic introgression plays a considerable role in the speciation process and the emergence of adaptive characters. Fitness of between-species hybrids usually sharply decreases with the divergence time of the concerned species and the divergence depth, which still allows for a successful crossing differs among principal clades of vertebrates. Recently, a review of hybridization events among distinct lizard species revealed that lizards belong to vertebrates with a highly developed ability to hybridize. In spite of this, reliable reports of experimental hybridizations between genetically fairly divergent species are only exceptional. Here, we show the results of the crossing of two distinct allopatric species of eyelid geckos possessing temperature sex determination and lacking sex chromosomes:  Eublepharis macularius  distributed in Pakistan/Afghanistan area and  E .  angramainyu , which inhabits Mesopotamia and adjacent areas. We demonstrated that F 1  hybrids were viable and fertile, and the introgression of  E .  angramainyu  genes into the  E .  macularius  genome can be enabled via a backcrossing. The examined hybrids (except those of the F 2  generation) displayed neither malformations nor a reduced survival. Analyses of morphometric and coloration traits confirmed phenotypic distinctness of both parental species and their F 1  hybrids. These findings contrast with long-term geographic and an evolutionary separation of the studied species. Thus, the occurrence of fertile hybrids of comparably divergent species, such as  E .  angramainyu  and  E .  macularius , may also be expected in other taxa of squamates. This would violate the current estimates of species diversity in lizards.

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Experimental Crossing of Two Distinct Species of Leopard Geckos, Eublepharis angramainyu and E. macularius: Viability, Fertility and Phenotypic Variation of the Hybrids