A Revision of the Nematode GenusSetariaViborg, 1795, its Host-parasite Relationship, Speciation and Evolution

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Abstract
In a revision of the genusSetaria s.l. the author gives a review of the literature on the systematics of this group. The genusSetaria s.l. is divided into three genera.Hyraconeman.g. monotypic forH. loveridgei(Sandground, 1928), a primitive worm of the hyracoids;SetariaViborg, 1795, monotypic for S.equina(Abildg., 1789) the common parasite of equine animals; andArtioneman.g. for the remaining species, all of which occur in artiodactyls.Artionema africanan.sp. is the genotype.A. africanais found inTragelaphusspp. and cattle in various parts of continental Africa. The other new speciesA. hartwichin.sp. is found in the European deer,CapreolusandAlceson continental Europe. The paper includes a discussion on host parasite relationship, phylogeny and the evolution of taxonomic characters in speciation. In the Subfamily Setariinae Yorke and Maplestone, 1926, the author recognizes five genera as follows:SkrjabinofilariaTrav., 1925;Hyraconemagen. nov.,SetariaViborg, 1795,PapillosetariaVevers, 1923 andArtionemagen. nov. The paper ends with a host list.