Full-likelihood genomic inference resolves intergroup hybrid speciation in the only known parthenogenetic pleurodont lizard ( Liolaemus parthenos )

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ID: 332552
2026
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Abstract
Hybridization is increasingly recognized as an important evolutionary process that can reshape genomes and generate novel lineages. One striking outcome is the origin of obligately parthenogenetic populations, often through interspecific hybridization. Here, we use genome-wide data and coalescent models to reconstruct the evolutionary history of Liolaemus parthenos, the only known parthenogenetic pleurodont lizard. We sampled the darwinii complex (L. darwinii, L. grosseorum, L. laurenti, and L. parthenos) and L. josei from the donosobarrosi group, selected as a candidate paternal lineage based on phylogenetic and biogeographic evidence. Mitochondrial data place L. parthenos within northern L. darwinii, consistent with a maternal origin, whereas nuclear genomic summaries position it between L. darwinii and L. josei. Bayesian model comparison supports a hybrid speciation model involving northern L. darwinii and L. josei, rejecting alternative parental combinations and models without introgression. Triangle plots further support a stabilized hybrid lineage. Climatic niche analyses reveal strong divergence from northern L. darwinii but substantial overlap with L. josei, partially supporting geographical parthenogenesis. More broadly, our study demonstrates the utility of model-based genomic approaches for resolving hybrid origins in non-model systems and expands the comparative framework for understanding the emergence and persistence of asexual vertebrate lineages.
Reference Key
openalex_W7222599622 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Kevin Imanol Sánchez, Edward A. Myers, Luciano Javier Ávila, Mariana M. Morando
Journal international journal of systematic and evolutionary microbiology
Year 2026
DOI
10.1093/evolut/qpag189
URL
https://doi.org/10.1093/evolut/qpag189
Keywords Keywords not found

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