DESCRIPTIONS OF FILENCHUS-PARAVESICULOSUS SP. N. AND 3 OTHER SPECIES OF THE GENUS FIENCHUS ANDRASSY, 1954 (NEMATA, TYLENCHIDAE) FROM IRAN

One new and three known species of the genus Filenchus with two latera l lines were found in the rhizosphere of wild and cultivated plants fr om Iran. Filenchus paravesiculosus sp, n. is characterised by its smal l size, 425-510 mu m; lateral field with two lines; cuticle coarsely s triated; conoid-rounded head with 1-2 annuli, and amphidial apertures longitudinal slits, relatively short ovary, offset and elongate sperma theca, and elongate-conoid tail with broadly rounded terminus. F. para vesiculosus sp. n. differs from F. vesiculosus by having shorter style t (6.0-7.5 mu m vs 9-11 mu m). It can be distinguished from F. faculta tivus, F. acris and F. neoparvus by the shape of tail terminus (broadl y rounded vs filiform to finely rounded) and having different head sha pe. Variation of the amphidial apertures is discussed. Filenchus forti s is a new record for Iran.