Descriptions of two new species of Iotonchus and first record of Coomansuszschokkei (Mononchida) from Korea

Two new species of the genus Iotonchus and Coomansus zschokkei (Menzel, 191 3) are described and illustrated. Iotonchus uisongensis sp. nov, is 1.5-1.6 mm long, a=23.0-26.0, b=2.8-3.2, c=17.1-19.4 (female) and 19.6-23.0 (male), V=67.0-73.0, buccal cavity=52.0-63.0 x 31.0-36.5 mum, spicule 75.0-92.0 mu m long, ventromedian supplements papillae 20-22 in numbers, and is characte rized by having not protruded labial papillae, supra basal dorsal tooth, an d flattened basal oblique plates of buccal cavity. Iotonchus damsanensis sp . nov. is 1.6-1.7mm long, a=19.7-22.0. b=2.9-3.0, c=17.2-21.7, V=71.0-74.5, buccal cavity=58.0-61.0 x 35.0-37.0 mum, and is characterized by having of fset lip region, well protruded labial papillae, basally tapered buccal cav ity, and in having pre-vulval papillae. Coomansus zschokkei reported here f or the first time from Korea is also described in detail with variation in the shape of male tail.