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The Use of Second-Stage Juvenile Tails as an Aid in the Identification of Meloidogyne Species

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For more content, see Nematology.

Second-stage juveniles of 33 Meloidogyne species are classified into 12 groups on the basis of similarities in tail shape. Within groups, species are distinguished by shape or by measurements of tail length and hyaline tail terminus length. These characters aid species differentiation because they are species-specific with little variation within species but exhibit broad variation over all the species in the genus: this is illustrated using principal coordinate and canonical variate analyses. Intra-specific variation in these characters is tested in different populations of three of the species, M. graminicola, M. naasi and M. javanica, where it is shown that although intra-specific variation is low, differences between populations may be larger than between some species. The combined use of tail shape and tail and hyaline tail terminus measurements in second-stage juveniles are considered to aid species identification when used together with good differentiating characters from other life stages.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts., England


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