Nematology , 2000, Vol. 2(1), 43-55 Symposium Patterns and processes in the evolution of animal parasitic nematodes Mark B LAXTER 1, * , Mark D ORRIS 1 and Paul D E L EY 2 1 Nematode Genetics, Ashworth Laboratories, Institute of Cell, Animal and Population Biology, University of Edinburgh, Edinburgh, EH9 3JT, UK 2 Vakgroep Biologie, Universiteit Gent, K.L. Ledegankstraat 35, 9000 Gent, Belgium Presented at the symposium ‘Biodiversity in the phylum Nematoda’ , Gent, Belgium, 17 September 1999 Summary – The parasitic Nematoda have traditionally been classi ed distinct from free-living species, and animal parasites treated separately from plant parasites. In classical concepts of phylogenetic relationships within the phylum, parasitic groups are usually afforded ordinal status and their origins are often obscure. We have been using molecular phylogeneticsto examine the interrelationships of animal parasites with free-living and plant-parasitic groups, and nd that a new view of the origins and radiation of animal parasites is warranted. Using sequence from the nuclear small subunit ribosomal RNA gene, we have constructed an alignment that allows robust phylogenetic inference. With this dataset, we place the Strongylida as a monophyletic clade nested within the Rhabditina. The Ascaridida, Oxyurida and Spirurida are
Nematology – Brill
Published: Jan 1, 2000
Keywords: RHABDITOPHANES; STRONGYLIDA; OXYURIDA; PARASITISM; MOLECULAR PHYLOGENETICS; ASCARIDIDA; SPIRURIDA; STRONGYLOIDES
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