The first record of Cyproidea liodactyla (Crustacea: Amphipoda: Cyproideidae) from Korean waters

by us­ ing a sledge net (mesh size 300 μm, mouth 79 size 120 × 45 cm). They were preserved directly in 95% ethyl alco­ hol after sorting in the laboratory. Before identification, they were stained by lignin pink dyes and the append­ ages were dissected in a Petri dish filled with glycerol using dissection forceps and needle under stereomicro­ scope (SZH10; Olympus, Tokyo, Japan). They were mounted on a temporary slide using a glycerol­ethanol mixed solution or on a permanent slide using polyvinyl lactophenol solution. Drawings were performed by light microscope (LABOPHOT­2; Nikon, Tokyo) with the aid of a drawing tube. The first record of Korean cyproideid amphipod, Cyproidea liodactyla Hirayama, 1978 is reported here with description and illustrations. This species has the following characteristics: the presence of dorsal keel of peduncle 2 on antenna 1, posterodistal process of ischium on gnathopod 1 and carpal process on gnathopod 2. In this study, the minor differences between the original description and our Korean specimens of Cyproidea liodactyla are discussed and a brief comparison to other related species such as C. serratipalma Schellenbeg, 1938 and C. robusta Ren, 2006 are suggested. In addition, a key to Korean species belonging to the family Cyproideidae is provided.