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Molecular evidence for the non-monophyletic status of Naidinae (Annelida, Clitellata, Tubificidae)
Stockholm University, Faculty of Science, Department of Zoology.
University of Gothenburg.
2006 (English)In: Molecular Phylogenetics and Evolution, ISSN 1055-7903, E-ISSN 1095-9513, Vol. 40, no 2, 570-584 p.Article in journal (Refereed) Published
Abstract [en]

Naidinae (former Naididae) is a group of small aquatic clitellate annelids, common worldwide. In this study, we evaluated the phylogenetic status of Naidinae, and examined the phylogenetic relationships within the group. Sequence data from two mitochondrial genes (12S rDNA and 16S rDNA), and one nuclear gene (18S rDNA), were used. Sequences were obtained from 27 naidine species, 24 species from the other tubificid subfamilies, and five outgroup taxa. New sequences (in all 108) as well as GenBank data were used. The data were analysed by parsimony and Bayesian inference. The tree topologies emanating from the different analyses are congruent to a great extent. Naidinae is not found to be monophyletic. The naidine genus Pristina appears to be a derived group within a clade consisting of several genera (Ainudrilus, Epirodrilus, Monopylephorus, and Rhyacodrilus) from another tubificid subfamily, Rhyacodrilinae. These results demonstrate the need for a taxonomic revision: either Ainudrilus, Epirodrilus, Monopylephorus, and Rhyacodrilus should be included within Naidinae, or Pristina should be excluded from this subfamily. Monophyly of four out of six naidine genera represented by more than one species is supported: Chaetogaster, Dero, Paranais, and Pristina, respectively

Place, publisher, year, edition, pages
2006. Vol. 40, no 2, 570-584 p.
Keyword [en]
Naidinae, Naididae, Rhyacodrilinae, Tubificidae, 12S rDNA, 16S rDNA, 18S rDNA;, Phylogeny, Taxonomy
National Category
Research subject
URN: urn:nbn:se:su:diva-27492DOI: 10.1016/j.ympev.2006.03.021OAI: diva2:214583
Available from: 2009-05-06 Created: 2009-05-05 Last updated: 2011-11-07Bibliographically approved
In thesis
1. Evolutionary Perspectives on Naidinae (Annelida, Clitellata, Naididae): Molecular and Morphological Revelations
Open this publication in new window or tab >>Evolutionary Perspectives on Naidinae (Annelida, Clitellata, Naididae): Molecular and Morphological Revelations
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Naidinae is a group of tiny oligochaetous clitellates, common all over the world, primarily in freshwater. The taxon includes about 180 nominal species. In this thesis it is shown (using molecular data) that Naidinae (sensu Erséus and Gustavsson, 2002) is non-monophyletic, since one genus, Pristina, formerly regarded as part of Naidinae, is well-separated from the remaining naidines by some genera of another clitellate subfamily, Rhyacodrilinae. The ultrastructure of coelomocytes from several naidine and rhyacodriline species are described and compared with each other and with coelomocytes previously studied, from other clitellate taxa. The naidine and rhyacodriline coelomocytes are similar, differing from those of other groups, which corroborates the hypothesis of a close relationship between Rhyacodrilinae and Naidinae.

Features of the chaetae are important taxonomic characters of Naidinae. However, the significance of chaetotaxy has been questioned. The correlation between genetic variation and chaetal morphology within the genus Nais is investigated. Principally, chaetal character patterns are congruent with the evolutionary lineages revealed by genetic data, but at least nine lineages correspond to at most six nominal species. The species complex Nais communis/variabilis appears to be a gathering of at least five separately evolving lineages. That is, cryptic speciation is revealed.

Finally, six molecular markers are used to elucidate the phylogenetic relationships within the group, and the resulting tree is used to track the evolution of morphological characters commonly used in naidine taxonomy. The tropical genera Dero, Branchiodrilus, and Allonais branch off from the base of the naidine tree of life, suggesting that Naidinae originally evolved in the tropics. Chaetal characters are shown to be homoplastic to a great extent within the group, most certainly contributing to the overall confusion in naidine systematics.

Place, publisher, year, edition, pages
Stockholm: Department of Zoology, Stockholm University, 2009. 48 p.
Naididae, Naidinae, phylogenetics, molecular systematics, morphology, ultrastructure
National Category
Biological Sciences
Research subject
Systematic Zoology
urn:nbn:se:su:diva-27533 (URN)978-91-7155-855-8 (ISBN)
Public defence
2009-06-03, Lilla hörsalen, Naturhistoriska riksmuseet, Frescativägen 40, Stockholm, 13:00 (Swedish)
Available from: 2009-05-13 Created: 2009-05-06 Last updated: 2009-06-01Bibliographically approved

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