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Occurrence patterns of chrysomelid beetles (  Coleoptera  :   Chrysomelidae  ), associated with willow (   Salix    spp.) at 42 sites across Europe, have previously been described. The sites form a transect from Greece (lat. 38.8 °N) to arctic Norway (lat. 69.7 °N). This paper reports additional records and the results of DNA sequencing in certain genera. Examination of further collections from the transect has added 13 species in the genera    Aphthona  ,   Chrysomela  ,   Cryptocephalus  ,   Epitrix   ,    Galerucella    (2 spp.),    Gonioctena  ,   Phyllotreta    (2 spp.),    Pachybrachis    (3 spp.) and    Syneta.    We also report the sequencing of the DNA regions cytochrome oxidase 1 (CO1) and cytochrome B (cytB) for a number of samples in the genera    Plagiodera  ,   Chrysomela  ,   Gonioctena  ,   Phratora  ,   Galerucella    and    Crepidodera.    The cytB sequences are the first available for some of these taxa. The DNA barcoding largely confirmed previous identifications but allowed a small number of re-assignments between related species. Most notably, however, it was evident that the southernmost material (Greece and Bulgaria) of specimens, previously treated as    Crepidodera   aurata    sens. lat., belonged to a distinctive molecular cluster. Morphological re-examination revealed these to be    C.   nigricoxis    Allard, 1878. This is an example of how morphotaxonomy and DNA barcoding can work iteratively to refine identification. Our sequences for    C.   nigricoxis    appear to be the first available for this taxon. Finally, there is little geographic structure evident, even in widely dispersed species.

Salix transect of Europe: additional leaf beetle ( Chrysomelidae ) records and insights from chrysomelid DNA barcoding