Haeckel, 1879
Exumbrella with deep radiating furrows from tentacles to apex, surrounded by ribs and supplementary ridges. Umbrella up to 30 mm wide, hemispherical; 12-16 tentacles; gonads with 2-4 lobes projecting into lappet cavities; 12-16 lappets ovate, pointed, each with 20 statocysts; otoporpae long tapering outwards.