Molecular Characterization of Filenchus cylindricus (Thorne & Malek, 1968) Niblack & Bernard, 1985 (Tylenchida: Tylenchidae) from Korea, with Comments on Its Morphology

Filenchus cylindricus (Thorne & Malek, 1968) Niblack & Bernard, 1985 was reported from the sandy rhizo-spheric soils of Poa pratensis and for the first time in Korea. Females and males are molecularly character-ized and morphological and morphometric data sup-plied. Identification was made using an integrative approach considering morphological characteristics and inferences drawn from the analyses of the D2-D3 expansion segment of 28S rRNA and ITS1-5.8S-ITS2 of rRNA partial sequences. Females and males from Korea conform to the type descriptions and also to sub-sequent species descriptions from Iowa and Colorado USA, Sudan and Pakistan. Despite the close morpho-logical and morphometric similarities with F. thornei (Andrássy, 1954) Andrássy, 1963, the two species can be adequately differentiated based on molecular data inference.