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Report on freshwater Catenulida (Platyhelminthes) from Sweden with the description of four new species
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Systematic Biology.
2010 (English)In: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, no 2396, 1-18 p.Article in journal (Refereed) Published
Abstract [en]

This contribution is one of the very first reports on Swedish species of freshwater Catenulida, a group of free-living, small flatworms. A total of 13 species were collected from 33 localities all over the country. Four species, all belonging to the taxon Stenostomum, are new to science. S. gotlandense n. sp., found on Gotland, has small ciliated pits located more posteriorly than other species of Stenostomum, large anterior brain lobes and a large mouth opening with peculiar wrinkles of the proximal rim of the pharynx. S. handoelense n. sp., from Jämtland, has long ciliated pits and a mobile prostomium with a lined appearance due to "metamerical" anterior brain lobes. S. heebuktense n. sp., from Bohuslän, has small ciliated pits and an extremely large and muscular pharynx which, in living animals, is bluish. S. steveoi n. sp., found in the provinces Bohuslän and Småland, has small ciliated pits and a large rectangular mouth opening. The remaining 9 species are illustrated and commented upon where necessary. For the sake of completeness three undescribed species are mentioned. Some general remarks on identification of catenulid species are given.

Place, publisher, year, edition, pages
2010. no 2396, 1-18 p.
Keyword [en]
Biodiversity, Faunistics, Flatworm, Taxonomy, Turbellaria
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-96770ISI: 000275370300001OAI: oai:DiVA.org:uu-96770DiVA: diva2:171453
Available from: 2008-02-27 Created: 2008-02-27 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Taxonomy and Phylogeny of Catenulida (Platyhelminthes) with Emphasis on the Swedish Fauna
Open this publication in new window or tab >>Taxonomy and Phylogeny of Catenulida (Platyhelminthes) with Emphasis on the Swedish Fauna
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis focuses on phylogenetic and taxonomic studies of Catenulida (Platyhelminthes). Catenulida is a group of microscopic free-living worms mainly found in freshwater habitats. The Swedish catenulid fauna was previously virtually unknown. The taxonomy of Catenulida is difficult because of the paucity of good morphological characters, which makes species identification extremely difficult.

Molecular phylogenies are inferred from DNA sequences. Based on two molecular markers, 18S rDNA and 28S rDNA, the phylogenetic position of Catenulida has now been well established as the sister group to the rest of the flatworms, Rhabditophora. Within Catenulida there is a basal split between two major clades: Retronectidae + Catenulidae and Stenostomidae. The hypothesis of the marine Retronectidae as the sister group of the limnic Catenulida is rejected.

Four molecular markers, 18S rDNA, 28S rDNA, ITS-5.8S and CO1, are used as a backbone to infer phylogeny and to generate hypotheses about species delimitation in Catenulida using parsimony jackknifing and Bayesian analysis. Anokkostenostomum comes out non-monophyletic, and Suomina nested within Catenula, so two new synonymies are proposed: Stenostomum Schmidt, 1848 (Anokkostenostomum Noreña et al. 2005) and Catenula Duges, 1832 (Suomina Marcus, 1945) are proposed.

A first report on Swedish freshwater Catenulida are given. A total of 13 species are reported from Sweden. Four of them, all belonging to the taxon Stenostomum are new to science: S. gotlandense n.sp.; S. handoelense n.sp.; S. heebuktense n.sp. and S. steveoi n.sp.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2008. 48 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 395
Keyword
Biology, taxonomy, phylogeny, molecular phylogenies, cryptic species, micro-invertebrate, Biologi, Catenulida, Platyhelminthes
Identifiers
urn:nbn:se:uu:diva-8470 (URN)978-91-554-7097-5 (ISBN)
Public defence
2008-03-20, Zootissalen, Evolutionsmuseet, Villavägen 9, Uppsala, 10:00
Opponent
Supervisors
Available from: 2008-02-27 Created: 2008-02-27Bibliographically approved

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Larsson, Karolina

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