An integrative study of N ecremnus T homson ( H ymenoptera: E ulophidae) associated with invasive pests in E urope and N orth A merica: taxonomic and ecological implications

The species of N ecremnus attacking two invasive pests of tomato and canola in E urope and N orth A merica, respectively, T uta absoluta ( M eyrick) ( L epidoptera: G elechiidae) and C eutorhynchus obstrictus ( M arsham) ( C oleoptera: C urculionidae), have been revised using an integrative taxonomy approach. Molecular data from the mitochondrial cytochrome oxidase c subunit I and the nuclear D2 expansion region of the 28 S ribosomal subunit and internal transcribed spacer 2, the discovery of new morphological features, and study of type material resulted in the delineation of three species groups, the N ecremnus artynes , N ecremnus cosconius , and N ecremnus tidius groups, the discovery of four new species, and the resurrection of three taxa from synonymy. Lectotypes have been designated for 13 species originally described in E ulophus by W alker. Although N ecremnus has not been revised, an illustrated key is given to differentiate 23 recognized E uropean species. The key, type images, and treatments of the three species groups will enable more accurate identification of the valid species of N ecremnus in the future. They will also benefit biological control practitioners of pest species. The ecological consequences of the new taxonomic concepts are discussed. © 2015 The Authors. Zoological Journal of the Linnean Society published by John Wiley & Sons Ltd on behalf of The Linnean Society of London