Amphinema modernisme, a new Pandeid (Cnidaria : Anthomedusae) from the Southern Ocean

A new species of pandeid anthomedusa, Amphinema modernisme, is described fr om a single and complete specimen collected by a mid-water sediment trap pl aced at 500 m depth in open waters, over a 1066-m bottom in the Drake Passa ge near the South Shetland Islands. This new Amphinema is characterized by an egg-shaped apical chamber, partitioned by four narrow sacciform centrifu gal prolongations of the radical canals, perradial gonads and cellular stra nds linking the radial canals to the exumbrella. Its morphological features are compared with those of the eight other species of the genus Amphinema and a new diagnosis for this genus is presented.