Phylogenetic inference regarding Parergodrilidae and Hrabeiella periglandulata ('Polychaeta', Annelida) based on 18S rDNA, 28S rDNA and COI sequences

Autor(en): Jordens, J
Struck, T
Purschke, G 
Stichwörter: Annelida; Clitellata; CLITELLATA ANNELIDA; EVOLUTION; Evolutionary Biology; GENE-SEQUENCES; HISTONE H3; MITOCHONDRIAL-DNA; MOLECULAR PHYLOGENY; molecular systematics; NUCLEOTIDE SUBSTITUTIONS; phylogeny; RIBOSOMAL-RNA; TERRESTRIAL POLYCHAETE; terrestrial polychaetes; TRANSITION BIAS; Zoology
Erscheinungsdatum: 2004
Herausgeber: WILEY
Journal: JOURNAL OF ZOOLOGICAL SYSTEMATICS AND EVOLUTIONARY RESEARCH
Volumen: 42
Ausgabe: 4
Startseite: 270
Seitenende: 280
Zusammenfassung: 
Parergodrilidae and Hrabeiella periglandulata are Annelida showing different combinations of clitellate-like and aclitellate characters. Similarities between both of these taxa and Clitellata have widely been regarded as the result of convergent evolution due to similar selection pressures. The position of the three taxa in the phylogenetic system of Annelida is still in debate. However, in analyses based on 18S rDNA sequences a close relationship of Parergodrilidae with Orbimidae and Questidae was suggested. To infer their phylogeny the sequences of the 28S rDNA and of the cytochrome oxidase I (COI) gene of Stygocapitella subterranea, Parergodrilus heideri and H. periglandulata were determined. The data were extended by sequences of various species including species from Clitellata and Orbiniidae. Prior to tree reconstruction the dataset was analysed in detail for phylogenetic content by applying a sliding window analysis, a likelihood mapping and Modeltest V.3.04. Subsequently, generalized parsimony and maximum likelihood methods were employed. Clade robustness was estimated by bootstrapping. In addition, combined analyses of the sequences of 18S rDNA and 28S rDNA as well as of 18S rDNA, 28S rDNA and COI were performed. The combination of the data of the two structure genes and a mitochondrial gene improved the resolution obtained with the single datasets slightly. These analyses support a close relationship of Parergodrilidae and Orbimidae but cannot resolve the position of H. periglandulata. In every analysis Clitellata cluster within `Polychaeta', confirming previous investigations.
ISSN: 09475745
DOI: 10.1111/j.1439-0469.2004.00265.x

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