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Cruznema velatum sp. n. from Mexico is differentiated by elongated tail and advulval cuticular membranes formed by lateral fields. C. tripartitum (LINSTOW) is briefly redescribed, and the generic characters of Cruznema ARTIGAS are discussed.
Dimensions and ratios of three Psilenchus species are examined for their variability. None of the studied ratios fits requirements for species characterization, as outlined in recently published studies. However, use of ratios is not rejected because inherent gene pool of each species limits the size of nematode allowing to use ratios, which are not mathematically correct. P. klingleri sp. n., from...
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