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new species,Pratylenchus gongjuensisn. sp. was isolated from chrysanthemum rots atGongju, Chungnam Province, Korea. Morphologicalcharacteristics ofP. gonguensisclosely resemble tothose ofP. subpenetranslonger (female; 518-626 vs. 330-481 , male;㎛ ㎛514-581 vs. 329-472 ). A values of male are㎛ ㎛smaller (a=24.5-26.0 vs. 23.7-32.1), and the spiculelength is also longer (18.2-21.0 vs. 14 ). From㎛P. penetrans, P. gongjuensiscan be distinguishedby length of posterior uterine branch length havingabout one to four vulva body width long, butP.penetransshort and undifferentiated.P. gongjuensisdiffers fromP. mediterraneusCorbett, 1983, whichis newly recorded in Korea, in having longer㎛). ㎛ Measurements and morphological descriptionson P. meidterraneusand P. vulnusare also provided.Key words Systematics, Pratylenchidae,Praty-lenchus gongjuensis, Pratylenchus mediterraneus,Pratylenchus vulnus.