Kramp, 1959
Umbrella up to 1.5 mm wide and high, mesoglea thin; manubrium small, cruciform; mouth with very short simple lips; gonads thick, cylindrical along almost entire length of radial canals; 4 long perradial marginal tentacles, with broad bulbs; no rudimentary bulbs; 7-8 marginal cirri in each quadrant; 4 interradial or 8 adradial statocysts.