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The spinigera group of Megaselia (Diptera, Phoridae): molecular phylogeny, revision of the known Swedish fauna, and description of a new species
Stockholm University, Faculty of Science, Department of Zoology. Swedish Museum of Natural History, Sweden.ORCID iD: 0000-0002-9294-3078
Stockholm University, Faculty of Science, Department of Zoology.ORCID iD: 0000-0002-3929-251X
(English)Manuscript (preprint) (Other academic)
Abstract [en]

With 1,600 described species, the scuttle-fly genus Megaselia is one of the largest genera of all organisms. A recent comprehensive molecular phylogenetic study suggests that most of the Megaselia species fall into a monophyletic group, the “core Megaselia clade”, leaving only two lineages outside: the spinigera group and the ruficornis group. Here, we focus on the spinigera group. We present a molecular analysis of its phylogenetic position within the subfamily Metopininae, and of relationships within it. The analysis is based on broader taxon sampling than in previous studies, covering additional lineages both within and outside the group. Our analysis supports the recognition of an “extended Megaselia clade” — including Myriophora, Pseudacteon, the M. ruficornis group and core Megaselia — and indicates that the spinigera group may be the sister group of this clade. Furthermore, our analysis shows that the spinigera group contains several species previously placed in Plastophora, Phalacrotophora or Kerophora, and we discuss the possibility of recognizing the spinigera group as a separate genus under one of those names. We also revise the known Swedish fauna of the group based primarily on study of material from Malaise traps, and show that the fauna includes a hitherto unknown species, which is described as M. proctoluteipes n. sp. Finally, we present a key to the known Swedish species.

Keyword [en]
New species, phylogeny, Megaselia spinigera group, Phoridae, Metopininae
National Category
Biological Systematics
Research subject
Systematic Zoology
Identifiers
URN: urn:nbn:se:su:diva-133434OAI: oai:DiVA.org:su-133434DiVA: diva2:958408
Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2016-09-16Bibliographically approved
In thesis
1. Charting biodiversity: Scuttle flies and other poorly known insects in Sweden
Open this publication in new window or tab >>Charting biodiversity: Scuttle flies and other poorly known insects in Sweden
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Biodiversity has fascinated people in all times. We as a species are part of the global ecosystem and our survival depends on many other species around us. Charting biodiversity, however, has proven more difficult than one could imagine. When Linnaeus and others started describing which species there are on Earth, people in general, and taxonomists in particular, could not imagine that we would not be finished 300 years later and even less that we would not be able to tell exactly how much there is left to describe.

In this PhD thesis, I deal with relatively large organisms (compared to the average size of organisms left to be described), namely insects in general and scuttle flies in particular, within a limited and well-studied geographic region (Sweden). Nevertheless, the results show that we are far from completing the inventory for even this limited portion of global biodiversity. Since it was in Sweden that Linnaeus started his work and where he did most of it, the Swedish flora and fauna belong to the best known in the world. In spite of this, we show in paper I of this thesis that it is likely that a considerable portion of the Swedish insect fauna remains to be discovered. The white spots on the biodiversity map primarily concern small Diptera and Hymenoptera species that are decomposers or parasitoids. The scuttle flies (Diptera: Phoridae) are one of the insect families that contain more undescribed species than species known to science, both in Sweden and elsewhere. The situation is complicated by the fact that a large portion of the known scuttle-fly diversity is placed within a single genus, Megaselia, one of the most species-rich genera in the animal kingdom; almost 40 % of described phorids belong to this genus. Our lack of understanding of phylogenetic relationships within Megaselia has made taxonomic progress on the genus very difficult. In paper II, we define a new natural clade within Megaselia, the lucifrons group, based on both molecular and morphological evidence. We show that the group comprises at least three species in Sweden, one of which is described by us as new to science. In paper III, we present the first comprehensive molecular phylogeny of Megaselia. We identify 22 well-supported natural clades within the genus, comprising at least two species each. These clades are recognized as species groups; most of them have not been described previously. We identify eight additional, isolated single-species lineages, which may turn out to represent multi-species clades when molecular data become available for more species. The paper includes the description of 45 species new to science, all from Sweden. In paper IV, we revise the most basal of the 22 species groups, the spinigera group, and describe one additional new species to science from Sweden in this group. The thesis provides the first reasonably complete phylogenetic framework for Megaselia and its closest relatives, greatly facilitating further research into scuttle-fly diversity in Sweden and elsewhere.

Place, publisher, year, edition, pages
Stockholm: Department of Zoology, Stockholm University, 2016. 50 p.
National Category
Biological Systematics
Research subject
Systematic Zoology
Identifiers
urn:nbn:se:su:diva-133436 (URN)978-91-7649-501-8 (ISBN)978-91-7649-502-5 (ISBN)
Public defence
2016-11-04, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
The Swedish Taxonomy Initiative (ArtDatabanken, SLU), dha 158/09 1.4
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Manuscript. Paper 3: Manuscript. Paper 4: Manuscript.

Available from: 2016-10-12 Created: 2016-09-07 Last updated: 2016-09-29Bibliographically approved

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