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Paratylenchinae: evaluation of diagnostic morpho-biometrical characters of females in the genus Paratylenchus Micoletzky, 1922 (Nematoda: Tylenchulidae)

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Examination of morphological variability within single female lines of Paratylenchus microdorus, P. straeleni, P. bukowinensis and P. projectus showed that females offer a limited number of characters useful for differentiation of similar species. The most stable were index V, followed by stylet length, conus length and index m. The most variable were tail length and shape, indices c' and c, and these are considered unreliable for separation of similar species. It is concluded that the description of a Paratylenchus species should be based on adults of both sexes as well as resistant juvenile stage.

L'étude de la variabilité morphologique dans des lignées issues d'une femelle de Paratylenchus microdorus, P. straeleni, P. bukowinensis et P. projectus a montré que les femelles possédaient un nombre limité de caractères utiles pour la différenciation d'espèces proches. Les plus stables sont le rapport V, puis la longueur du stylet, la longueur du cône et le rapport m. Les plus variables sont la longueur et la forme de la queue, les rapports c' et c, ces caractères étant considérés comme inutilisables pour séparer des espèces proches. Il en découle que la description d'une espèce de Paratylenchus devrait être fondée tant sur les adultes des deux sexes que sur les stades juvéniles résistants.

Affiliations: 1: deceased; Research Institute of Vegetable Crops, 96-100 Skierniewice, Poland; 2: Research Institute of Vegetable Crops, 96-100 Skierniewice, Poland


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