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A new classification of the long-horned caddisflies (Trichoptera: Leptoceridae) based on molecular data
Stockholm University, Faculty of Science, Department of Zoology, Department of Systematic Zoology. Stockholm University, Faculty of Science, Department of Zoology.
Naturhistoriska Riksmuseet, Enheten för Entomologi.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Background

The Leptoceridae is among the three largest families within the order Trichoptera (caddisflies). The current classification is founded on a phylogenetic work from the 1980’s, mainly based on morphological characters from adult males, i.e. wing venation, tibial spur formula and genital morphology. In order to get a second opinion about the relationships within the family, we have undertaken a molecular study of the family based on sequences from five genes; one mitochondrial and four nuclear. 

Results

The resulting phylogenetical hypotheses are more or less congruent with the morphologically based classification, with most genera and tribes recovered as monophyletic, but with some major differences. For monophyly of the two subfamilies Triplectidinae and Leptoceriane, one tribe of each had to be removed and erected to subfamily status and the monophyly of some genera and tribes have to be questioned. All clades but the subfamily Leptocerinae were stable across different analysis methods, results presumably based on the taxon sampling.

Conclusions

With support from the results obtained here we erect the tribes Grumichellini and Leptorussini to subfamily status, Grumichellinae and Leptorussinae, respectively. We are also confident in the discovery of a few non-valid genera that are synonymised, e.g. Ptochoecetis with Oecetis and Condocerus with Hudsonema.

National Category
Biological Systematics
Research subject
Systematic Zoology
Identifiers
URN: urn:nbn:se:su:diva-38579OAI: oai:DiVA.org:su-38579DiVA: diva2:310961
Available from: 2010-04-19 Created: 2010-04-19 Last updated: 2010-04-19Bibliographically approved
In thesis
1. Climbing the Trichoptera Tree: Investigations of Branches and Leaves
Open this publication in new window or tab >>Climbing the Trichoptera Tree: Investigations of Branches and Leaves
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The Trichoptera (caddisflies) is the largest of the primary aquatic insect orders, currently including more than 13,500 species. With more than 100 species new to science described annually, the known caddisfly diversity is rapidly increasing. In the first four papers of this Thesis, a total of 22 species new to science are described. The first three papers include revisions of the New Caledonian species for the genera Symphitoneuria, Gracilipsodes and Triplectides, with descriptions of 3, 7 and 11 new species, respectively. In these papers I strengthen our image of New Caledonia as a biodiversity hotspot. The fourth paper describes a new genus and species from Madagascar, another biodiversity hotspot. These four papers all deal with species and genera of the family Leptoceridae, which ranks among the three largest families within Trichoptera. The family comprises high species diversity together with a widespread distribution and has been of interest to many trichopterologists. However, the classification used for genera and tribes within the family follows a phylogenetic hypothesis from 1981. In paper V I apply a molecular approach for hypothesising phylogenetic relationships within the family, revealing support for the erection of two tribes to subfamily level and for the synonymisations of 2 pairs of genera. At order level, the progress of illuminating the evolutionary history of Trichoptera is advancing with recent analyses using molecular based data. Previously published phylogenetic hypotheses of the order were to a large degree dependent on ribosomal DNA, a source of molecular data not without its controversies, particularly regarding alignment procedures. Paper VI presents Trichoptera phylogenies based on sequences of protein-coding nuclear and mitochondrial genes. My results correspond well to previously published hypotheses among suborder relationships, but show additional and contrasting resolution within suborders.

Place, publisher, year, edition, pages
Stockholm: Department of Zoology, Stockholm University, 2010. 26 p.
Keyword
Trichoptera, Leptoceridae, Symphitoneuria, Gracilipsodes, Triplectides, morphology, DNA, systematics, phylogeny, New Caledonia, Madagascar, new species, new genus
National Category
Biological Systematics
Research subject
Systematic Zoology
Identifiers
urn:nbn:se:su:diva-38583 (URN)978-91-7447-033-8 (ISBN)
Public defence
2010-05-21, Lilla Hörsalen, Naturhistoriska riksmuseet, Frescativägen 40, Stockholm, 13:00 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Manuscript. Paper 5: Manuscript. Paper 6: Manuscript.Available from: 2010-04-28 Created: 2010-04-19 Last updated: 2010-04-21Bibliographically approved

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