A systematic study of the genus Ormyrus (Chalcidoidea, Ormyridae) was conducted based on the morphology and biology of the terminal-instar larvae of ten west European species that are parasitoids of gall wasps and gallflies of the families Cynipidae, Eurytomidae and Tephritidae. The first detailed descriptions are provided of the terminal-instar larvae of these ten species using SEM images to i...

Ten Eurytomidae (Hymenoptera) parasitic wasp species described by Jean Brèthes and deposited in the Museo Argentino de Ciencias Naturales in Buenos Aires are treated and their nomenclature stabilized. The condition of the type material is described. Lectotypes are designated for Decatoma cecidosiphaga Brèthes, Prodecatoma parodii Brèthes, Eudecatoma opposita Brèthes, and Eurytoma caridei Brèthe...

Most insects harbor two paralogous circadian genes, namely timeout and timeless. However, in the Hymenoptera only timeout is present. It remains unclear whether both genes, especially timeout in hymenopteran insects, have distinct evolutionary patterns. In this study, we examine the molecular evolution of both genes in 25 arthropod species, for which whole genome data are available, with additi...

Sirovena Bouček (Chalcidoidea: Pteromalidae, Pireninae) was known only from females of its type species, S. stigma Bouček, 1988. Males and host associations were both unknown. Both sexes of a second species of Sirovena, S. costallifera sp. nov., reared from Ficus microcarpa L. (Moraceae) in Yunnan, China, are described based on morphological characters and mitochondrial COI sequences. The males...