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Ratios and Indexes in Nematode Taxonomy

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image of Nematologica
For more content, see Nematology.

It is proposed to call "Index" the ratios traditionally included in nematode descriptions (ratios a, b, c, V, etc.) when they are used as a numerical expression of an ordered qualitative character (such as the shape or the position of an organ), and to reserve the name of "Ratios" to the entities recently reviewed by Roggen, Revets and Van den Berghe (Nematologica, 1987). It is shown that it is always possible to use an index instead of an ordered qualitative character for describing a shape or a position, as long as the index is biologically related to the characteristic being described. Indexes are more objective than the corresponding qualitative characters. Also, they can be used in parametric statistical analyses, and in particular in discriminant function analyses.

Affiliations: 1: California Department of Food and Agriculture, Analysis & Identification, P.O. Box 942871, Sacramento, CA 94271-0001, U.S.A.


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