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Monophyly of the Family Desmoscolecidae (Nematoda, Demoscolecida) and Its Phylogenetic Position Inferred from 18S rDNA Sequences

  • Hwang, Ui Wook (Department of Biology, Teachers College and Department of Biology, Graduate School, Kyungpook National University) ;
  • Choi, Eun Hwa (Department of Biology, Teachers College and Department of Biology, Graduate School, Kyungpook National University) ;
  • Kim, Dong Sung (Marine Resources Research Department, Korea Ocean Research and Development Institute) ;
  • Decraemer, Wilfrida (Department of Invertebrates, Royal Belgian Institute of Natural Sciences) ;
  • Chang, Cheon Young (Department of Biological Science, College of Natural Sciences, Daegu University)
  • Received : 2008.10.20
  • Accepted : 2009.03.06
  • Published : 2009.05.31

Abstract

To infer the monophyletic origin and phylogenetic relationships of the order Desmoscolecida, a unique and puzzling group of mainly free-living marine nematodes, we newly determined nearly complete 18S rDNA sequences for six marine desmoscolecid nematodes belonging to four genera (Desmoscolex, Greeffiella, Tricoma and Paratricoma). Based on the present data and those of 72 nematode species previously reported, the first molecular phylogenetic analysis focusing on Desmoscolecida was done by using neighbor joining (NJ), maximum parsimony (MP), maximum likelihood (ML) and Bayesian inference (BI) methods. All four resultant trees consistently and strongly supported that the family Desmoscolecidae forms a monophyletic group with very high node confidence values. The monophyletic clade of desmocolecid nematodes was placed as a sister group of the clade including some members of Monhysterida and Araeolaimida, Cyartonema elegans (Cyartonematidae) and Terschellingia Iongicaudata (Linhomoeidae) in all the analyses. However, the present phylogenetic trees do not show any direct attraction between the families Desmoscolecidae and Cyartonematidae. Within the monophyletic clade of the family Desmoscolecidae in all of the present phylogenetic trees, there were consistently observed two distinct subgroups which correspond to the subfamilies Desmoscolecinae [Greeffiella sp. + Desmoscolex sp.] and Tricominae [Paratricoma sp. + Tricoma sp].

Keywords

Acknowledgement

Grant : Origin of biological diversity of Korea: molecular phylogenetic analyses of major Korean taxa

Supported by : Korea Research Foundation, National Institute of Biological Resources

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