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The 18S ribosomal RNA gene of Soboliphyme baturini Petrow, 1930 (Nematoda: Dioctophymida) and its implications for phylogenetic relationships ...

The 18S ribosomal RNA gene of Soboliphyme baturini Petrow, 1930 (Nematoda: Dioctophymida) and its... AbstractPhylogenetic estimations from 18S rDNA sequence data reveal closerelationships of dioctophymids with Trichinellida (Trichocephalida), thelatter represented by the families Trichinellidae and Trichocephalidae(Trichuridae). This phylogeny is congruent with a scenario of molecularevolution deduced from conservative motifs within the V4 and V9 regions of18S rRNA. A phylogenetic approach to analyse data containing highly unequalrates of sequence evolution is proposed. The entire gene possesses only afew conservative molecular synapomorphies of a clade consisting ofDorylaimida, Mononchida and Mermithida. Dioctophymida, together withTrichinellida, are inferred as a sister taxon to this clade which jointlyconstitute the Dorylaimia. Molecular data juxtaposed with morphology wereused to reconstruct some of the putative features of the common ancestor ofDorylaimia which is speculated to have possessed a spear and, as found inextant Enoplia and Dioctophymida, pharyngeal gland outlets located in thestoma. Mononchids are postulated to have secondarily lost the spear contraryto all previously published phylogenies. Reduction of caudal glands andtransformation of pharyngeal glands into the stichosome are not parsimoniousacross the tree of Dorylaimia. There are no unequivocal adult morphologicalsynapomorphies for Dorylaimia; the only non-molecular diagnostic feature isthe unique specification of the endodermal precursor in earlyembryogenesis. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematology Brill

The 18S ribosomal RNA gene of Soboliphyme baturini Petrow, 1930 (Nematoda: Dioctophymida) and its implications for phylogenetic relationships ...

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References (48)

Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
1388-5545
eISSN
1568-5411
DOI
10.1163/156854103322683337
Publisher site
See Article on Publisher Site

Abstract

AbstractPhylogenetic estimations from 18S rDNA sequence data reveal closerelationships of dioctophymids with Trichinellida (Trichocephalida), thelatter represented by the families Trichinellidae and Trichocephalidae(Trichuridae). This phylogeny is congruent with a scenario of molecularevolution deduced from conservative motifs within the V4 and V9 regions of18S rRNA. A phylogenetic approach to analyse data containing highly unequalrates of sequence evolution is proposed. The entire gene possesses only afew conservative molecular synapomorphies of a clade consisting ofDorylaimida, Mononchida and Mermithida. Dioctophymida, together withTrichinellida, are inferred as a sister taxon to this clade which jointlyconstitute the Dorylaimia. Molecular data juxtaposed with morphology wereused to reconstruct some of the putative features of the common ancestor ofDorylaimia which is speculated to have possessed a spear and, as found inextant Enoplia and Dioctophymida, pharyngeal gland outlets located in thestoma. Mononchids are postulated to have secondarily lost the spear contraryto all previously published phylogenies. Reduction of caudal glands andtransformation of pharyngeal glands into the stichosome are not parsimoniousacross the tree of Dorylaimia. There are no unequivocal adult morphologicalsynapomorphies for Dorylaimia; the only non-molecular diagnostic feature isthe unique specification of the endodermal precursor in earlyembryogenesis.

Journal

NematologyBrill

Published: Jan 1, 2003

Keywords: MOLECULAR PHYLOGENY; LONG BRANCH ATTRACTION ARTEFACT; SECONDARY STRUCTURE; MAXIMUM LIKELIHOOD; MAXIMUM PARSIMONY; BAYESIAN INFERENCE; SSU RRNA; HOMOPLASY

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