Bouillon, 1984
Leptomedusae with narrow, short manubrium; mouth with 4 long, fluted lips; without gastric peduncle; with 80-100 hollow tentacles; endoderm of tentacles extends inwards from bell margin into bell mesoglea; with 4 radial canals; gonads completely surrounding radial canals; without permanent rudimentary tentacles; without marginal and lateral cirri; numerous closed statocysts.
Genus Blackfordia