Analysis of 18S rRNA gene sequences suggests significant molecular differences between Macrodasyida and Chaetonotida (Gastrotricha)

Analysis of 18S rRNA gene sequences suggests significant molecular differences between Macrodasyida and Chaetonotida (Gastrotricha)

Partial 18S rRNA gene sequences of four macrodasyid and one chaetonotid gastrotrichs were obtained and compared with the available sequences of other gastrotrich species and representatives of various metazoan phyla. Contrary to the earlier molecular data, the gastrotrich sequences did not comprise...

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Bibliographic Details
Published in:Molecular phylogenetics and evolution Vol. 30; no. 3; pp. 850 - 854
Main Authors: Manylov, Oleg G., Vladychenskaya, Natalia S., Milyutina, Irina A., Kedrova, Olga S., Korokhov, Nikolai P., Dvoryanchikov, Gennady A., Aleshin, Vladimir V., Petrov, Nikolai B.
Format: Journal Article
Language:English
Published: United States Elsevier Inc 01-03-2004
Subjects:
18S rRNA
Animals
Bilateria
Brackish
Chaetonotida
Evolution, Molecular
Freshwater
Gastrotricha
Helminths - genetics
Likelihood Functions
Macrodasyida
Marine
Molecular phylogeny
Nematoda
Nematoda - genetics
Phylogeny
RNA, Ribosomal, 18S - genetics
rRNA 18S
Tetranchyroderma
Xenotrichula
Molecular phylogeny
Bilateria
18S rRNA
Gastrotricha
Chaetonotida
Macrodasyida
Nematoda
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Summary:Partial 18S rRNA gene sequences of four macrodasyid and one chaetonotid gastrotrichs were obtained and compared with the available sequences of other gastrotrich species and representatives of various metazoan phyla. Contrary to the earlier molecular data, the gastrotrich sequences did not comprise a monophyletic group but formed two distinct clades, corresponding to the Macrodasyida and Chaetonotida, with the basal position occupied by the sequences of Tetranchyroderma sp. and Xenotrichula sp., respectively. Depending on the taxon sampling and methods of analysis, the two clades were separated by various combinations of clades Rotifera, Gnathostomulida, and Platyhelminthes, and never formed a clade with Nematoda. Thus, monophyly of the Gastrotricha is not confirmed by analysis of the presently available molecular data.
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ISSN:1055-7903
1095-9513
DOI:10.1016/S1055-7903(03)00251-3