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The systematic position of Opistocystidae (Annelida, Clitellata) revealed by DNA data
University of Gothenburg.
Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen.
Instituto Nacional de Limnología (CONICET-UNL), Ciudad Universitaria, Santa Fe, Argentina.
Swedish Museum of Natural History.
2010 (Engelska)Ingår i: Molecular Phylogenetics and Evolution, ISSN 1055-7903, E-ISSN 1095-9513, Vol. 54, nr 1, s. 309-313Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Opistocystidae Cernosvitov, 1936 is a largely Neotropical oligochaete taxon containing seven species. its familial status has never been formally challenged, although possible close relationships with Naididae and Phreodrilidae have been noted. Mitochondrial 12S and 16S rDNA, and nuclear 18S rDNA, of a range of aquatic oligochaete taxa, including Trieminentia corderoi (Opistocystidae), were analysed by Bayesian inference. This showed that T. corderoi is a derived lineage within Naididae, closely related to Pristina and its monotypic subfamily Pristininae. Opistocystidae as a whole (with its three genera, Opistocysta, Trieminentia, and Crustipellis) is thus likely to be a group within Naididae.

Ort, förlag, år, upplaga, sidor
2010. Vol. 54, nr 1, s. 309-313
Nyckelord [en]
Aquatic oligochaetes; Pristininae; Molecular systematics; Phylogeny; Taxonomic classification
Nationell ämneskategori
Biologisk systematik
Forskningsämne
systematisk zoologi
Identifikatorer
URN: urn:nbn:se:su:diva-27506DOI: 10.1016/j.ympev.2009.09.037ISI: 000273518500029OAI: oai:DiVA.org:su-27506DiVA, id: diva2:214586
Tillgänglig från: 2009-05-06 Skapad: 2009-05-05 Senast uppdaterad: 2017-12-13Bibliografiskt granskad
Ingår i avhandling
1. Evolutionary Perspectives on Naidinae (Annelida, Clitellata, Naididae): Molecular and Morphological Revelations
Öppna denna publikation i ny flik eller fönster >>Evolutionary Perspectives on Naidinae (Annelida, Clitellata, Naididae): Molecular and Morphological Revelations
2009 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Zoology, Stockholm University, 2009. s. 48
Nyckelord
Naididae, Naidinae, phylogenetics, molecular systematics, morphology, ultrastructure
Nationell ämneskategori
Biologiska vetenskaper
Forskningsämne
systematisk zoologi
Identifikatorer
urn:nbn:se:su:diva-27533 (URN)978-91-7155-855-8 (ISBN)
Disputation
2009-06-03, Lilla hörsalen, Naturhistoriska riksmuseet, Frescativägen 40, Stockholm, 13:00 (Svenska)
Opponent
Handledare
Tillgänglig från: 2009-05-13 Skapad: 2009-05-06 Senast uppdaterad: 2009-06-01Bibliografiskt granskad

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