Seven species of medusae were collected using scuba equipment in neritic waters of McMurdo Sound, Ross Sea, Antarctica. Two species dominated, the narcomedusaSolmundella bitentaculataand the scyphomedusaDiplulmaris antarctica. Two new taxa were found.Leuckartiara brownein. sp., a pandeid anthomedusa, has gonads with two major longitudinal folds in the interradii and several smaller perradially directed folds. Besides four large perradial tentacles, it has up to 28 short “rudimentary” tentacles. This is the first report of this genus from the Southern Ocean.Benthocodon hyalinusn. gen., n. sp., a rhopalonematoid trachymedusa, has 8 linear to sinuous gonads on the radial canals. The tubular manubrium is attached to a gastric peduncle. The tentacles are numerous (about 800) and grow successively. This is the second reported trachymedusa from the Ross Sea.Solmundella bitentaculataate the thecosome pteropodLimacina helicina. Diplulmaris antarcticamedusae fed on the gymnosome pteropodClione antarcticaand onL. helicina.The hyperiid amphipodHyperiella dilatata, mostly females, was seen attached to the exumbrellas of bothD. antarcticaandS. bitentaculata. Up to 54 amphipods were seen on eachD. antarcticamedusa. The amphipods did no visible damage to the medu
展开▼
