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BackgroundParasitoid wasps of the genus    Pteromalus    play an important role in biological pest control, however, the genus includes a large number of cryptic species, which makes reliable identification difficult. The latest identification key dates back to Graham (1969) and since then many new species have been described and nomenclatural changes proposed.New informationHere we present an interactive and fully illustrated identification key in Xper3 for 27 species of the    Pteromalus   albipennis    species group as well as for 18 similar species. In addition to qualitative traits, a large set of body measurements is incorporated in the key. We also explored a new set of qualitative features on the propodeum and metasternum. During field work, a new species of the    P.   albipennis    species group,    P.   capito    Baur sp. n., could be reared from flower heads of   Asteraceae  , which is described here. It looks very similar to    P.   albipennis    and    P.   cingulipes   , however, several qualitative characters and body ratios distinguish it clearly from the most similar species.

biodiversity data journal

An interactive key to Central European species of the    Pteromalus   albipennis    species group and other species of the genus (  Hymenoptera  :   Chalcidoidea  :   Pteromalidae  ), with the description of a new species