Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Phylogeny and revised classification of terrestrial Parasitengona
Stockholm University, Faculty of Science, Department of Zoology. Swedish Museum of Natural History, Sweden.
Show others and affiliations
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Parasitengona mites include the aquatic water mites (Hydrachnidia) and the terrestrial parasitengones (Trombidia). They are characterised by having a parasitic larval stage and a complex life cycle with alternating active and inactive instars. The phylogenetic relationship between Hydrachnidia and Trombidia has been debated and the molecular phylogeny of Hydrachnidia was recently tested. Here we provide and analyze the most comprehensive molecular dataset of terrestrial Parasitengones to date based on the nuclear ribosomal genes 18S and 28S, and mitochondrial COI for 80 taxa. We find Hydrachnidia nested within Trombidia with Calyptostomatoidea being the sister group to Hydrachnidia. Stygothrombioidea is sister to remaining Parasitengona, Erythraeoidea and Tanaupodoidea are sister taxa and Trombiculoidea is a paraphyletic grade along with Chyzerioidea in relation to Trombidioidea. These results were supported and largely stable across various sensitivity analyses excluding sections of the ribosomal genes that were difficult to align as well as third codon position of COI. The exception was the relationship between the three groups (Calyptostomatoidea+Hydrachnidia), (Erythraeoidea+Tanaupodoidea) and (Trombidioidea+Trombiculoidea+Chyzerioidea) which was not resolved but varied between analyses. An elevated substitution rate was discovered in the taxon Neothrombiidae that created an extremely long branch and problems with long-branch attraction. Based on the result we provide a revised higher-level classification of Parasitengona where we recognize five non-Hydrachnidia superfamilies: Stygothrombioidea Thor, 1935, Tanaupodoidea Thor, 1935, Calyptostomatoidea Oudemans, 1923, Erythraeoidea Robineau-Desvoidy, 1828 and Trombidioidea Leach, 1815 (=Trombiculoidea Ewing, 1929 (n. syn.); =Chyzerioidea Womersley, 1954 (n. syn.); =Yurebilloidea Southcott, 1996) (n. syn.)). We also recognize Podothrombiidae Thor, 1935 at family level (n. stat.).

National Category
Biological Systematics
Research subject
Systematic Zoology
Identifiers
URN: urn:nbn:se:su:diva-139042OAI: oai:DiVA.org:su-139042DiVA: diva2:1070667
Funder
The Swedish Taxonomy Initiative (ArtDatabanken, SLU)
Available from: 2017-02-01 Created: 2017-02-01 Last updated: 2017-02-23
In thesis
1. Phylogeny, taxonomy and species delimitation of water mites and velvet mites
Open this publication in new window or tab >>Phylogeny, taxonomy and species delimitation of water mites and velvet mites
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This study is part of the Swedish Taxonomy Initiative (STI) - one of the most ambitious all taxa biodiversity inventories in the world. One of the pillars in STI is to support taxonomic research on the most neglected taxonomic groups with the aim to lift the level of knowledge of biodiversity in the country. There is still a lot to be discovered, especially in the microscopic world, and this includes mites. Many aspects of mite biology and diversity are poorly known, such as species richness, abundance, distribution, lifestyle and behavior of species. Mites inhabits all sorts of aquatic, terrestrial, arboreal and parasitic habitats, nevertheless even in well-studied systems mites are often overlooked. Despite being among the smallest of arthropods, they are of medical and economical importance and may be very abundant in the ecosystems they inhabit. This thesis focuses on Parasitengona (Acariformes: Prostigmata), one of the most diverse taxa among the arachnids. It includes the aquatic Hydrachnidia (water mites) and the terrestrial Trombidia (e.g. velvet mites, chiggers). A unifying characteristic of Parasitengona is their complex life cycle of active and inactive stages, parasitic larvae and predatory deutonymphs and adults. They typically parasitize and prey on arthropods, except the chiggers which have vertebrates as hosts. The aim of this thesis is to shed light on the phylogeny and taxonomy of Parasitengona with emphasis on the Swedish fauna. To achieve this, mites were collected from different localities throughout the country between the years 2007-2016. Water mites were sampled with a hand net. Larvae of terrestrial Parasitengona were collected with sweeping nets and sorted out from malaise trap samples from the Swedish Malaise Trap Project. To collect the adults Berlese-Tullgren extractor and pitfall traps were used as well as hand collecting and sifting with litter reducer. The material collected abroad was kindly provided through collaboration.  Methods used in the papers included morphometrics, multivariate analyses, experimental rearing, DNA extraction and sequencing, Bayesian phylogenetic analyses and molecular species delimitation. In paper I and II, we combine molecular species delimitation models and morphological data to resolve taxonomical issues. This integrative taxonomic approach of combining data resulted in Piona dispersa Sokolow, 1926 as a valid species and redescriptions, new synonyms and neotypes provided for Erythraeus phalangoides (De Geer, 1778),  E. cinereus (Dugès, 1834) and E. regalis (C.L. Koch, 1837). Based on the new inventories we produce an updated and annotated checklist of 105 terrestrial Parasitengona species for Fennoscandia in paper III, and use metadata to increase the knowledge on distribution, habitat preferences, life stages and abundance. Out of these, 20 species are new findings for the region and five are potential new species for science. In paper IV, we provide a molecular phylogeny of Parasitengona based on the genes 18S, 28S and COI for 80 taxa with a sampling focus on the terrestrial lineages. Based on the results we offer a revised higher-level classification of the group. In particular the analyses supported Tanaupodoidea Thor, 1935 as a separate superfamily, but Trombiculoidea Ewing, 1929 was not monophyletic and was synonymized, along with Chyzerioidea Womersley, 1954, with Trombidioidea Leach, 1815.

Place, publisher, year, edition, pages
Stockholm: Department of Zoology, Stockholm University, 2017. 33 p.
Keyword
Acariformes, Parasitengona, Hydrachnidia, Trombidia, water mites, velvet mites, taxonomy, cryptic species, species delimitation, DNA, GMYC, experimental rearing, new synonyms, distribution, phylogeny, revised classification
National Category
Biological Systematics
Research subject
Systematic Zoology
Identifiers
urn:nbn:se:su:diva-139045 (URN)978-91-7649-688-6 (ISBN)978-91-7649-689-3 (ISBN)
Public defence
2017-03-17, Lilla hörsalen, Naturhistoriska riksmuseet, Frescativägen 40, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

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

 

Available from: 2017-02-22 Created: 2017-02-02 Last updated: 2017-02-16Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Stålstedt, Jeanette
By organisation
Department of Zoology
Biological Systematics

Search outside of DiVA

GoogleGoogle Scholar

Total: 104 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf