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Keys to adults and larvae of the genera of West Palaearctic nematine sawflies are presented. Species of some of the smaller genera are keyed, and their taxonomy, distribution, and host plants reviewed, with a geographic focus on north-western Europe, particularly Sweden.    Dinematus    Lacourt, 2006 is a new junior subjective synonym of    Pristiphora    Latreille, 1810, resulting in the new combination    Pristiphora   krausi    (Lacourt, 2006) for the type species of    Dinematus   .    Hemichroa   monticola    Ermolenko, 1960 is a new junior subjective synonym of    Hemichroa   australis    (Serville, 1823). Lectotypes are designated for    Tenthredo   opaca    Fabricius, 1775,   Mesoneura   opaca   var.   nigerrima   Enslin, 1914,   Mesoneura   opaca   var.   obscuriventris   Enslin, 1914,    Nematus   hypogastricus    Hartig, 1837,    Nematus   alnivorus    Hartig, 1840,    Leptopus   rufipes    Förster, 1854,    Nematus   protensus    Förster, 1854, and   Platycampus   luridiventris   var.   pleuritica   Enslin, 1915. A phylogenetic analysis based on four genes (mitochondrial  COI  and nuclear  NaK ,  POL2 , and  TPI ) supports the current generic classification.

The West Palaearctic genera of Nematinae ( Hymenoptera , Tenthredinidae )