Morphometric Differentiation of Pratylenchus neglectus (RENSCH, 1924) and P. gotohi n. sp.(Nematoda: Pratylenchidae)

Six Japanese populations ascribed to Pratylenchus neglectus were compared in morphology and with statistics. Variability in outlines of lip region, spear knobs and tail terminus were observed: tail terminal outline is stable within a population and slight difference is recognized between some populations. Five morphometrics were selected to discriminate the 3 groups within the P. neglectus complex by the stepwise linear discriminant function analysis. The use of these selected characters were verified by the canonical discriminant function analysis and principal component analysis. The groups were identified as P. neglectus and 2 new Pratylenchus species, then characterized by the selected characters. P. gotohi n. sp., a possible sibling species of the P. neglectus, is described. The new species is distinguished from P. neglectus by the thicker spear knobs, posterior excretory pore, shorter postvulval uterine branch, lower m-value, larger number of tail annules (20 vs. 17 in mean values). Jpn. J. Nematol. 21: 26-42 (1991).

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