LEUCON-PARASIPHONATUS, A NEW SPECIES (CRUSTACEA, CUMACEA, LEUCONIDAE)FROM ANTARCTIC WATERS

Six specimens of Leucon parasiphonatus n. sp. were collected at depths ranging from 15 to 424 m in the vicinity of King George Island (South Shetland Islands, Antarctica) and the south eastern Weddell Sea. Leuc on parasiphonatus belongs to the subgenus Leucon and differs from the other already known Antarctic and Subantarctic species of the genus, i n the absence of a serrated dorsomedian line and in the presence of a long pseudorostrum with several fine setae at its tip, surrounding the very long branchial siphon. The surface of the carapace is granulated ; the carapace displays no teeth except for a few at its antero-latera l margin and at its ventral margin. The species most similar to Leucon parasiphonatus is Leucon siphonatus, reported from Mediterranean and North Atlantic waters.