Parkellus park us gen. n., sp. n. and Miconchus koreanus sp. n. (Mononchida), two new predaceous nematodes from Korea

Abstract

A new genus of Mononchidae. Parkellus. with type species, P. parkus sp. n., from Korea is proposed and described. Its dorsal tooth is quite posteriorly located in the buccal cavity and this helps in differentiating the new genus from Coomansus Jairajpuri, 1977 which has its dorsal tooth situated anterior to middle of dorsal vertical wall. -P. parkus sp. n. is 2.07-2.50 mm long, buccal cavity 55-62×28-32 µm. cardia without tubercles, female gonads amphidelphic, spicules 82-92 µm long, gubernaculum 30-35 µm. veniromedian supplements 21-25 and tails 85-95 µm or 1.5 to 2.0 anal body-widths long. Miconchus koreanus sp. n. is unique in the genus Miconchus Andrassy 1958, because of its mono-prodelphic gonad without any trace of posterior sexual branch. Body 1.32-1.68 mm. long, buccal cavity 38-45x26-28 µm. cardia tuberculate and tails 117-142 µm or 3.5-4.0 anal body-widths long. The new species, M. koreanus sp. n. comes close to M. digiturus (Cobb, 1893) Andrassy, 1958 and M. tridonlus Buangsuwon & Jensen. 1966 but has no posterior rudimentary sexual branch or uterine sac.