The tribe Scymnini Mulsant, 1846 (Coleoptera: Coccinellidae) is a species-rich and ecologically diverse group widely recognized for its role as a biocontrol agent against homopterous insects, including aphids, psyllids, mealybugs, and whiteflies. However, the phylogenetic relationships within Scymnini and their evolutionary history remain poorly understood. We present what is, to our knowledge, the first most taxonomically comprehensive molecular phylogeny of the tribe to date, with emphasis on the Asian lineage, aiming to establish a framework for future studies on this ecologically significant insect group. Phylogenetic trees were inferred using maximum likelihood and Bayesian approaches based on five nuclear and three mitochondrial markers, comprising a total of 4,935 bp. The ingroup included 94 Scymnini taxa, complemented by 40 outgroup species representing diverse coccinellid subfamilies and tribes, to test the phylogenetic relationships among Asian Scymnini. Our results indicate that the Asian Scymnini is paraphyletic, with Axinoscymnus, Slipinskiscymnus, and Clitostethus forming a distinct clade separate from the main Asian Scymnini lineage. Despite this, the analysis strongly supports the monophyly of these genera, along with Nephus, Sasajiscymnus, Nephaspis, and Horniolus. Additionally, the Asian Scymnus was recovered as paraphyletic, as two species of the subgenus Scymnus (Orthoscymnus) Canepari formed a well-supported clade distinct from the main Scymnus lineage. Molecular dating based on fossil record suggests that generic diversification within the Asian Scymnini occurred between the Paleocene and Miocene, while the common ancestor of Coccinellidae dates back to the Early Cretaceous, approximately 143 Ma. Our results provide a novel phylogenetic framework for revising Scymnini classification and offer new insights into its evolutionary history, with broader implications for understanding Coccinellidae phylogeny.
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