Günther, 1903
With 8 primary marginal tentacles, some secondary tentacles and minute dwarf tentacles; 4 radial canals bifurcating near point of origin in 8 straight canals joining circular canal (occasionally branching again); 4 interradial gonads. Umbrella up to about 20 mm wide and high, globe-shaped, with thick walls; manubrium small, barrel-shaped.