Taxonomic study on the photid amphipods (Senticaudata, Corophiida, Photoidea, Photidae) from Korean waters, with descriptions of a new genus and seven new species.

In this paper, seven new species of the family Photidae from Korean waters are described and illustrated in detail. Among them, is a monotype of the newly reported , which is characterized by slenderer and more elongate pereopods 5-7 than those of other genera of the family Photidae. The genus is reported for the first time from Korean waters based on the description of , which is differentiated from other s group by having weakly sexual dimorphic gnathopods 2, those have simple palmar margins in both sexes. Three new species of are also described: , , and The formerly misidentified from Japan and China as well as the Korean material could be classified as a new species, For that, the syntypes of were re-examined, and lectotype and paralectotypes were newly designated in this study. is characterized by quadrate tooth on the palmar margin medially on gnathopod 2 in both sexes. shows a pointed posterior lobe on the ischium and a well-developed process of the propodus on male gnathopod 2. can be distinguished from other species of the genus by very elongate carpus of male gnathopod 1. Two new species belonging to the genus are also reported: has a strongly bisinuous palmar margin on male gnathopod 2, and differs from the closely related species of by different shape of the palmar margin and shorter dactylus of male gnathopod 2. Additionally, a key to the Korean species of Photidae is provided.