Abstract
A new monstrilloid species belonging to the genus <TEX>$Cymbasoma$</TEX> is described as a preliminary result from nocturnal surveys using a light trap on the east and south coasts of South Korea. Monstrilloid copepods are first recorded in South Korea. <TEX>$Cymbasoma$</TEX> <TEX>$striifrons$</TEX> n. sp. resembles <TEX>$C.$</TEX> <TEX>$striatum$</TEX> (Isaac, 1974) and <TEX>$C.$</TEX> <TEX>$tumorifrons$</TEX> Isaac, 1975 in sharing the character combination of transverse striations on forehead, somewhat small body (generally slightly less or longer than 1 mm), single lobed leg 5 bearing a short medial seta in female, and smooth lateral margin of anal somite without notch and wrinkles. However, <TEX>$C.$</TEX> <TEX>$striifrons$</TEX> n. sp. differs from <TEX>$C.$</TEX> <TEX>$striatum$</TEX> by relatively short and swollen cephalothorax, and rather strongly wrinkled genital somite. <TEX>$Cymbasoma$</TEX> <TEX>$striifrons$</TEX> n. sp. is also distinguished from <TEX>$C.$</TEX> <TEX>$tumorifrons$</TEX> in lacking a rounded protuberance on anterior margin of ventral surface and by relatively short cephalothorax and the number of ventral nipple-like processes on cephalothorax. Herein the new species is described and illustrated, with some comments on the morphological comparison with its allied species.
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