A New and One Unrecorded Species of Pratylenchus from Korea (Nematoda: Pratylenchidae)

A new species, Pratylenchus gongjuensis n. sp. was isolated from chrysanthemum roots at Gongju, Chungnam Province, Korea. Morphological characteristics of P. gonguensis closely resemble to those of P. subpenetrans, but body length is much longer (female; 518-626 μpm vs. 330-481 μm, male; 514-581 μm vs. 329-472 μm). A values of male are smaller (a=24.5-26.0 vs. 23.7-32.1), and the spicule length is also longer (18.2-21.0 vs. 14 μm). From P. penetrans, P. gongjuensis can be distinguished by length of posterior uterine branch length having about one to four vulva body width long, but P. penetrans short and undifferentiated. P. gongjuensis differs from P. mediterraneus Corbert, 1983, which is newly recorded in Korea, in having longer posterior uterine branch (47.6-93.8 μm vs. 18-25 μm). Measurements and morphological descriptions on P. meidterraneus and P. vulnus are also provided.