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The Morphology of the Terminal Area of the Round-Cyst Nematodes, S.G. Heterodera Rostochiensis and Allied Species

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For more content, see Nematology.

Between the vulva and the tail of round-cyst nematodes, Heterodera s.g. Globodera, is a distinct area of transversely ridged cuticle containing the anus. Differences in the size of this area divide the group into two and differences in the number of ridges and the type of branching subdivide each group. The vulva is a shallow pit on the walls of which are two crescentic papillated areas. Their size and the form of the papillae on them are characters that, together with the differences in the terminal area, may be used to distinguish species and pathotypes. The morphological differences between H. rostochiensis pathotypes A, B and E (British notation) are as great as those between described species. The group has probably diversified because populations are isolated and inbred.

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


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