First Record of Monstrilloid Copepods in Korea: Description of a New Species of the Genus Cymbasoma (Monstrilloida, Monstrillidae)

A new monstrilloid species belonging to the genus Cymbasoma 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. Cymbasoma striifrons n. sp. resembles C. striatum (Isaac, 1974) and C. tumorifrons 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, C. striifrons n. sp. differs from C. striatum by relatively short and swollen cephalothorax, and rather strongly wrinkled genital somite. Cymbasoma striifrons n. sp. is also distinguished from C. tumorifrons 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