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Trois Nouvelles Especes Du Genre Rotylenchoides Whitehead, 1958 (Nematoda - Tylenchida)

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The author describes and figures three new species belonging to the genus Rotylenchoides Whitehead, 1958: R. intermedius n. sp., R. variocaudatus n. sp. and R. affinis n. sp. The first, very close to the type species R. brevis Whitehead, 1958, differs by having a posterior ovary which is not reduced to a post-uterine sac but to a rather long, single file of degenerated cells, and by having a vulva more anteriorly placed. R. variocaudatus n. sp. and R. affinis n. sp. differ from the two other species by having a tail not hemispherical but longer than the anal diameter and generally conoid. These two species differ from each other in the location of the phasmids and the structure of the lateral field on the tail. Males are known for R. intermedius n. sp. but not for the other two new species. The author amends the diagnosis of the genus Rotylenchoides: the posterior ovary is not functional but reduced to a rather long single file of degenerated cells or to a post-uterine sac; the reference to the shape of the tail is suppressed because of its variability. The taxonomic position of the genus Rotylenchoides seems to be in the subfamily Hoplolaiminae, near Helicotylenchus Steiner, 1945, notwithstanding the reduction of the posterior ovary. This single last character does not seem sufficient to justify the existence of the subfamily Rotylenchoidinae Whitehead, 1958.

Affiliations: 1: Office de la Recherche Scientifique et Technique Outre-Mer, Institut d'Enseignement et de Re-cherches Tropicales, Abidjan, Côte d'Ivoire, Africa


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