New and known species of Dorylaimoidea (Nematoda: Dorylaimida) from Singapore

A new genus and three new and nine known species of Dorylaimoidea are recorded for the first time from Singapore. Raffiesius singaporensis gen. n., sp. n. is characterised by having a continuous lip region with amalgamated lips; labial papillae not protruding above labial contour; slender, dorylaimoid odontostyle with aperture one third its length; abrupt pharyngeal expansion; DO and DN far posterior to beginning of expansion; both pair of subventrals in the posterior third of expanded part; monoopisthodelphic female genital system, and long filiform tail. Oriverutus nusi sp. n. is characterised by having 0.81-0.89 mu m long, slender body; offset lip region with distinct lips and labial papillae; 19-20 mu m long, attenuated odontostyle; amphidelphic female genital system and elongate conoid tail with slightly dorsally bent tip. Saevadorella microstyla sp. n. is characterised by having 0.33-0.37 mm long body; offset lip region; 10.5-11.5 mu m long, attenuated odontostyle; rod-like odontophore; amphidelphic female genital system and short, conoid, ventrally arcuate tail. Saevadorella parva sp. n. is characterised by having 0.37-0.54 mu m long body; distinctly offset lip region; 21.5-22.5 mu m long attenuated odontostyle; amphidelphic genital system and short conoid, ventrally arcuate tail. Mesodorylaimus flagellatus, M. pusillus, Amphidorylaimus infecundus, Discolaimium clavatum, Labronema nepalense, Oriverutus sundarus, O. microdorus, O. parvus and O. asaccatus are recorded for the first time from Singapore.