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A new subspecies of the European cerambycid    Saperda   populnea    (Linnaeus, 1758) is described:    Saperda   populnea   lapponica    ssp. n.  based on specimens from Scandinavia. The male genitalia characters were examined and found to provide support for this separation, as well as differences in morphology, geographical distribution and bionomy. The preferred host tree for the nominate subspecies    S.   populnea   populnea    is    Populus   tremula    L., whereas    S.   populnea   lapponica    ssp. n.  is considered to be monophagous on    Salix   lapponum    L. DNA sequence data of mitochondrial cytochrome oxidase subunit I ( COI ) was generated from Scandinavian specimens of    S.   populnea   populnea    and specimens representing    S.   populnea   lapponica    ssp. n.  The two subspecies were not reciprocally monophyletic and genetic distances in  COI  were small. All synonyms of    S.   populnea   populnea    have been considered, and species similar to    S.   populnea   populnea    have been examined, and not found to be related to    S.   populnea   lapponica    ssp. n.  A male lectotype has been designated for each of the two following synonyms:    Cerambyx   decempunctatus    De Geer, 1775, and    Saperda   salicis    Zetterstedt, 1818. The synonymised species from Asia,    S.   balsamifera    (Motshulsky, 1860), is elevated to subspecies:    S.   populnea   balsamifera    stat. n.  We end with a discussion on the definition of subspecies under the unified species concept.

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To be or not to be a subspecies: description of    Saperda   populnea   lapponica    ssp. n. (  Coleoptera  ,   Cerambycidae  ) developing in downy willow (   Salix   lapponum    L.)