Abstract
The aphid genus Eulachnus in Europe is revised to include 12 species, using an integrative taxonomy approach, based on morphometric, molecular and biological traits. Fundatrix, apterous and alate viviparous female of a new species–Eulachnus stekolshchikovi Kanturski sp. nov. are described. Neotypes are designated for E. agilis, E. brevipilosus and E. nigricola. Lectotypes are designated for E. alticola, E. cembrae, E. rileyi and E. tuberculostemmatus. New synonyms are proposed: E. abameleki syn. nov. (= Cinara pini), E. cretaceus syn. nov. (= E. agilis), E. tauricus syn. nov. (= E. rileyi), E. pallidus syn. nov. (= E. tuberculostemmatus). Eulachnus mingazzinii (near Cinara piniphila) and E. nigrofasciatus (near C. brauni) are regarded as incertae sedis. Full species status is given for E. garganicus stat. nov. and E. ibericus stat. nov. Apterous viviparous female of E. cembrae; apterous and alate viviparous females of remaining species are redescribed. Sexual morphs of E. agilis, E. alticola, E. cembrae, E. intermedius, E. nigricola, E. rileyi and oviparous female of E. tuberculostemmatus are fully redescribed and figured for the first time. Fundatrices of E. agilis, E. brevipilosus, E. cembrae, E. rileyi and E. tuberculostemmatus, sexuales of E. brevipilosus and the alate male of E. tuberculostemmatus are described and figured. A new host plant–Pinus cembra for E. brevipilosus is reported, and this species is recorded for the first time from Czech Republic. Eulachnus tuberculostemmatus is reported for the first time from Croatia. Phylogenetic studies, based on the COI and ITS2 molecular markers, are provided to visualize and discuss the relationships within the European species. COI barcodes are provided for seven species.
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