Four new and two known species of the family Qudsianematidae (Nematoda: Dorylaimida) from Japan

摘要

Four new and two known species belonging to the family Qudsianematidae Jairajpuri, 1965 are described and illustrated. Eudorylaimus intermedius sp. n. is characterized by having 0.76 - 0.84 mm long body; lip region distinctly offset; large amphids;10 -11 mu m long odontostyle; a post-median transverse vulva; distinctly sclerotized pars refringens vaginae; ventrally arcuate tail, and males with three to four ventromedian supplements. E. niaesi sp. n. has 1.85 - 2.36 mm long, slender body; lip region offset by slight depression; small, stirrup-shaped amphids; 19 - 20 mu m long odontostyle; distinctly enlarged DN; transverse vulva; spherical vagina with well developed pars refringens vaginae; small genital branches, and conoid, ventrally arcuate tail. E. kyotoensis sp. n. has 1.90 -1.96 mm long, slender body; lip region offset by depression with projecting labial papillae; large amphids; 22.5 - 23.5 mu m long odontostyle; transverse vulva; pars refringens vaginae small; well developed genital branches, and conoid, ventrally arcuate tail. Paraxonchium japonicum sp. n. has 0.66 - 0.80 mm long, robust body; lip region rounded, distinctly offset; large amphids; 20 - 21 mu m long, asymmetrical odontostyle with short aperture; pharyngeo-intestinal junction with three distinct gland cells; post-median transverse vulva; strongly sclerotized pars refringens vaginae; amphidelphic gonad and short, conoid, almost straight tail. Ecumenicus monohystera (de Man, 1880) Thorne, 1974 and Mylodisctts nanus Thome, 1939 are reported here for the first time from Japan.