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The development of modern methods of species delimitation, unified under the “integrated taxonomy” approach, allows a critical examination and re-evaluation of complex taxonomic groups. The rose chafer  Protaetia  ( Potosia )  cuprea  is a highly polymorphic species group with a large distribution range. Despite its overall commonness, its taxonomy is unclear and subject to conflicting hypotheses, most of which largely fail to account for its evolutionary history. Based on the sequences of two mitochondrial markers from 65 individuals collected across the species range, and a detailed analysis of morphological characters including a geometric morphometry approach, we infer the evolutionary history and phylogeography of the  P .  cuprea  species complex. Our results demonstrate the existence of three separate lineages in the Western Palearctic region, presumably with a species status. However, these lineages are in conflict with current taxonomic concepts. None of the 29 analyzed morphological characters commonly used in the taxonomy of this group proved to be unambiguously species- or subspecies- specific. The geometric morphometry analysis reveals a large overlap in the shape of the analyzed structures (pronotum, meso-metaventral projection, elytra and aedeagus), failing to identify either the genetically detected clades or the classical species entities. Our results question the monophyly of  P .  cuprea  in regard to  P .  cuprina , as well as the species status of  P .  metallica . On the other hand, we found support for the species status of the Sicilian  P .  hypocrita . Collectively, our findings provide a new and original insight into the taxonomy and phylogeny of the  P .  cuprea  species complex. At the same time, the results represent the first attempt to elucidate the phylogeography of these polymorphic beetles.

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Phylogeography and DNA-based species delimitation provide insight into the taxonomy of the polymorphic rose chafer Protaetia (Potosia) cuprea species complex (Coleoptera: Scarabaeidae: Cetoniinae) in the Western Palearctic