The species of Necremnus attacking two invasive pests of tomato and canola in Europe and North America, respectively, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) and Ceutorhynchus obstrictus (Marsham) (Coleoptera: Curculionidae), 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 28S 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 Necremnus artynes, Necremnus cosconius, and Necremnus 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 Eulophus by Walker. Although Necremnus has not been revised, an illustrated key is given to differentiate 23 recognized European species. The key, type images, and treatments of the three species groups will enable more accurate identification of the valid species of Necremnus in the future. They will also benefit biological control practitioners of pest species. The ecological consequences of the new taxonomic concepts are discussed.

中文翻译：

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Necremnus Thomson（膜翅目：Eulophidae）与欧洲和北美入侵性害虫相关的综合研究：分类学和生态学意义

Necremnus 的种类分别攻击欧洲和北美的番茄和油菜两种入侵害虫 Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) 和 Ceutorhynchus obstrictus (Marsham) (Coleoptera: Curculionidae)，已使用综合分类法进行了修订. 来自线粒体细胞色素氧化酶 c 亚基 I 和 28S 核糖体亚基和内部转录间隔区 2 的核 D2 扩展区的分子数据、新形态特征的发现以及对类型材料的研究导致了三个物种组的划定artynes、Necremnus cosconius 和 Necremnus tidius 群，四个新物种的发现，以及从同义词中复活的三个分类群。已经为沃克最初在 Eulophus 中描述的 13 个物种指定了选型。虽然 Necremnus 没有被修改，但给出了一个插图的钥匙来区分 23 个公认的欧洲物种。三个物种群的关键、类型图像和处理将使得未来能够更准确地识别 Necremnus 的有效物种。它们还将使害虫物种的生物控制从业人员受益。讨论了新分类概念的生态后果。