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Molecular phylogeny of the Eucoila/Trybliographa complex (Hymenoptera: Cynipoidea: Figitidae)
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Systematic Biology.
Department of Entomology, Swedish Museum of Natural History.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The Eucoilinae are small parasitic wasps attacking larvae of Diptera. Some species are important biological control agents; others are popular model organisms. One of the most species-rich groups in the Holarctic is the Eucoila/Trybliographa complex, which has previously been in a state of major classificatory disorder. One of the reasons for this has been the lack of knowledge of phylogenetic relationships. To address this, we have made a molecular phylo-genetic analysis of 51 taxa, comprising a representative sample of taxa of the complex, based on 28S nuclear ribosomal and CytB mitochondrial sequences. The analysis clearly shows the Eucoila/Trybliographa complex to be a monophyletic group. Within this group, there is a basal division between a Paleotropic, species-poor branch, identified as the genus Bothrochacis, and a species-rich, largely Holarctic branch comprising the remainder of the complex. A basal lineage within the latter corresponds to the genus Eucoila, and another to the small genus Linoeucoila from Taiwan. However, their exact relationships to each other and to basal lineages of the big genus Trybliographa, which comprises the remainder of the clade, remains uncertain. Within Trybliographa, several interesting relationships are suggested, but the result is not robust or comprehensive enough at this point for a major reclassification of the genus.

Keyword [en]
Eucoila, Trybliographa, Eucoilini, Eucoilinae, Figitidae, Cynipoidea, Hymenoptera, phylogenetic analysis
National Category
Biological Systematics
Research subject
Entomology; Systematic Zoology
Identifiers
URN: urn:nbn:se:uu:diva-109391OAI: oai:DiVA.org:uu-109391DiVA: diva2:272338
Available from: 2009-10-15 Created: 2009-10-14 Last updated: 2010-01-14
In thesis
1. Systematics of Eucoilini: Exploring the diversity of a poorly known group of Cynipoid parasitic wasps
Open this publication in new window or tab >>Systematics of Eucoilini: Exploring the diversity of a poorly known group of Cynipoid parasitic wasps
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Many animal species are still undiscovered, even in Sweden. This thesis deals with the wasps of the subfamily Eucoilinae (of Figitidae, Cynipoidea), a poorly known group of small parasitoids of Dipteran flies. In this group, old classifications are chaotic, knowledge of old taxa is scant, phylogenetic work has recently started, and many new taxa remain to be described.

In this thesis, an identification key is given to the European genera of Eucolinae, and a tribal classification of the subfamily is reintroduced, based on recent phylogenetic results. Most of the thesis focuses on the tribe Eucoilini. That tribe is analyzed phylogenetically in two analyses, one based on a large morphological dataset, the other on two molecular markers, ribosomal 28S and mitochondrial Cytochrome B.

The monophyletic core group of Eucoilini is the Eucoila/Trybliographa complex. It is treated in a big taxonomic revision, based on studies of several hundred possibly relevant type specimens and several thousands of other specimens, and on the phylogenetic analyses.

More than 500 names of possible members of this group are investigated, and many new combinations are proposed, of species found not to belong within the group, as well as those that did, including some which are transferred to other genera in accordance with the new phylogenetic results. The new genus Quasimodoana is erected, and 20 new species described (8 from Northern Europe, 12 from elsewhere). More than 180 new combinations, more than 50 new species-level synonyms and ca 10 genus-level synonyms, are proposed.

Within this complex, the basal split is found to have been between a Paleotropic, specis-poor lineage (Bothrochacis), and a species-rich and largely Holarctic lineage, dominated by Trybliographa but also including the small genera Eucoila and Linoeucoila. The three are not satisfactorily resolved in the analysis, but still maintained as separate genera for pragmatic reasons. It is hypothesized that this group originated in Asia during the Eocene or Oligocene, attacking calyptrate flies in herbivore dung. Then it separated in a tropical branch retaining the ancestral life history mode, and a Holarctic branch, where some lineages specialised in Anthomyiidae and colonised the microhabitats of fungi and plants, speciating extensively in the boreal forests.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 55 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 679
Keyword
Eucoila, Trybliographa, Eucoilini, Eucoilinae, Figitidae, Cynipoidea, Hymenoptera, phylogenetics, diagnostics, classification, taxonomy, systematic revision, morphology
National Category
Biological Systematics
Research subject
Entomology; Systematic Zoology
Identifiers
urn:nbn:se:uu:diva-109400 (URN)978-91-554-7628-1 (ISBN)
Public defence
2009-11-27, Zootissalen, Villavägen 9, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2009-11-06 Created: 2009-10-15 Last updated: 2009-11-06Bibliographically approved

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