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A molecular phylogeny of the Rhigonematomorpha De Ley & Blaxter, 2002 as inferred from SSU and LSU rDNA sequences

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A molecular hypothesis of the Infraorder Rhigonematomorpha is presented. The phylogeny recovered using combined SSU and LSU markers suggests that the Rhigonematomorpha is nested within a larger clade that includes Ascaridomorpha, Spiruromorpha and Oxyuridomorpha and is strongly supported by maximum likelihood (ML) bootstrap support values (BS) and Bayesian posterior probabilities (BPP). SSU and LSU ML and Bayesian analyses recovered Rhigonematomorpha as a paraphyletic clade. In the ML and Bayesian analyses of a combined matrix of complete to partial sequences of SSU and LSU, respectively, Rhigonematomorpha is recovered as a monophyletic clade with moderate BPP but low BS. Highly supported BS and BPP of a combined SSU and LSU matrix support a hypothesis of a monophyletic Superfamily Ransomnematoidea that includes the families Carnoyidae, Hethidae, Ransomnematidae plus a Brumptaemilius, Cattiena, Insulanema clade, and a monophyletic Superfamily Rhigonematoidea that probably includes the paraphyletic families Rhigonematidae and Ichthyocephalidae. It is suggested that the future inclusion of more families and genera might help resolve the monophyly of the Infraorder Rhigonematomorpha as advanced here.

Affiliations: 1: Laboratorio de Ecología y Sistemática de Microartrópodos, Departamento de Ecología y Recursos Naturales, Facultad de Ciencias, UNAM, México D.F. C.P. 04510, Mexico


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