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Phylogeny of the parasitic wasp subfamily Euphorinae (Braconidae) and evolution of its host preferemces
Swedish Museum of Natural History, Department of Zoology.
Swedish Museum of Natural History, Department of Bioinformatics and Genetics.
2015 (English)In: Systematic Entomology, ISSN 0307-6970, E-ISSN 1365-3113, Vol. 40, no 3, 570-591 p.Article in journal (Refereed) Published
Abstract [en]

The braconid subfamily Euphorinae is a large, cosmopolitan group of endoparasitoid wasps. The majority of species attack adult hosts, a strategy that is rare among parasitic wasps, but there are also many species that attack nymphs and larval stages. Euphorine hosts may belong to a variety of insect orders (Coleoptera, Hemiptera, Hymenoptera, Neuroptera, Psocoptera, Orthoptera and Lepidoptera) although most euphorine tribes are confined to Coleoptera. Here we investigate the phylogenetic relationships of the Euphorinae based on molecular data (3 kb of nucleotide data from four markers: 18S, 28S, CAD and COI) and propose a higher-level classification based upon the resulting phylogeny. We also infer the evolution of host associations and discuss the diversification of the Euphorinae. Results from both Bayesian inference and maximum-likelihood analysis show that the subfamily, as previously circumscribed, is paraphyletic. We propose that the subfamily be expanded to include the tribes Meteorini and Planitorini (Mannokeraia + Planitorus), so that it corresponds to a clade that is strongly supported as monophyletic in our analyses. Based on our results, a revised higher classification of the Euphorinae is proposed, in which 52 extant genera and 14 tribes are recognized. We reinstate the genus Microctonus belonging to the tribe Perilitini, and synonymize Ussuraridelus with Holdawayella, Sinuatophorus with Eucosmophorus. Furthermore, we propose the following tribal rearrangements: Spathicopis and Stenothremma are transferred to Perilitini; Tuberidelus, Eucosmopho- rus and Plynops to Cosmophorini; Ecclitura to Dinocampini; Chrysopophthorus, Holdawayella and Wesmaelia to Helorimorphini; Proclithroporus and Heia to Towne- silitini. The monotypic tribe Cryptoxilonini is synonymized with Cosmophorini. The genera Pygostolus and Litostolus are placed in a separate tribe, Pygostolini, previously recognized as a subtribe among the Centistini. Parsimony-based ancestral state recon- structions suggest that the ancestor of Euphorinae was a parasitoid of lepidopteran larvae, and that a host shift to larval Coleoptera occurred only in one clade of the Meteorini, some members of which secondarily shifted back to larval lepidopteran hosts. In the remainder of the subfamily, there was an initial shift from larval to adult coleopterans, followed by subsequent shifts to adults or larvae of Hemiptera, Hymenoptera, Neuroptera, Orthoptera and Psocoptera. 

Place, publisher, year, edition, pages
Wiley-Blackwell, 2015. Vol. 40, no 3, 570-591 p.
National Category
Natural Sciences
Research subject
Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-1244DOI: 10.1111/syen.12122OAI: oai:DiVA.org:nrm-1244DiVA: diva2:822925
Funder
The Swedish Taxonomy Initiative (ArtDatabanken, SLU), Dha 167/08 1.4 & Dha 2013-145
Available from: 2015-06-17 Created: 2015-06-17 Last updated: 2015-06-22Bibliographically approved

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Stigenberg, JuliaRonquist, Fredrik
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CiteExportLink to record
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