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The species status of    Hyphydrus   anatolicus    Guignot, 1957 and    H.   sanctus    Sharp, 1882, previously often confused with the widespread    H.   ovatus    (Linnaeus, 1760), are tested with molecular and morphological characters. Cytochrome c oxidase subunit 1 ( CO1 ) was sequenced for 32 specimens of all three species. Gene-trees were inferred with parsimony, time-free bayesian and strict clock bayesian analyses. The GMYC model was used to estimate species limits. All three species were reciprocally monophyletic with  CO1  and highly supported. The GMYC species delimitation analysis unequivocally delimited the three species with no other than the three species solution included in the confidence interval. A likelihood ratio test rejected the one-species null model. Important morphological characters distinguishing the species are provided and illustrated. New distributional data are given for the following species:    Hyphydrus   anatolicus    from Slovakia and Ukraine, and    H.   aubei    Ganglbauer, 1891, and    H.   sanctus    from Turkey.

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Species delimitation of the    Hyphydrus   ovatus    complex in western Palaearctic with an update of species distributions (  Coleoptera  ,   Dytiscidae  )