Submitted to: University of California Publications in Entomology
Publication Type: Book / Chapter
Publication Acceptance Date: 11/15/2007
Publication Date: 5/27/2008
Citation: Gates, M.W. 2008. Species Revision and Generic Systematics of World Rileyinae (Hymenoptera: Eurytomidae). University of California Publications in Entomology. 127:332.
Interpretive Summary: Parasitic wasps attacking gall midges are an important component for controlling these often pestiferous flies. Understanding the relationships and biology of parasitic wasps enhances basic knowledge of the group and enhances their use in biological control programs against important gall midge pests. In this monograph, an hypothesis of relationship is proposed for the group, 44 new species are described, biology summarized, and taxonomy updated. This information is useful to regulatory officials at ports, biocontrol workers, and pest managers combating agriculturally important gall midges.
Technical Abstract: Chalcidoidea includes 19 families of cosmopolitan parasitic hymenopterans ranging in size from 0.2 mm to 15 mm. Species of Chalcidoidea, with 21, 250 nominal species, parasitize (rarely prey on) many arthropods: twelve orders of Insecta, two orders of Arachnida, and one family of Nematoda. In Eurytomidae, ~87 genera and 1,400 species are recognized as valid. The subfamily Rileyinae is characterized by a reduced prepectus, foreshortened anterior gastral terga, and 2 to 3 anelli. Herein, Rileyinae sensu stricto contains 6 genera (Rileya, Platyrileya, Neorileya, Dougiola, Austrophotismus, Boucekiana) and 69 species for which keys are provided (44 species described as new). A morphological data set was analyzed to determine generic relationships in Rileyinae and its placement within Eurytomidae. Forty-one morphological characters were scored across 52 taxa (23 genera of Eurytomidae, 10 species of Rileyinae, and 3 outgroup taxa) and analyzed using maximum parsimony with PAUP*. An additional analysis of taxa of Rileyinae (28 species of Rileya plus representatives of 4 other genera of Rileyinae; Heimbrinae as the outgroup) using the above character matrix with an additional 9 characters useful in interspecific differentiation supported Rileya + Platyrileya and Neorileya as monophyletic within Rileyinae. Also included are tables detailing host utilization for Eurytomidae (genera) and Rileyinae (species) as well as confirmed or suspected plant hosts (by plant family) for Rileyinae.