Bouillon, 1984
Leptomedusae with very short manubrium; with large gastric peduncle; mouth with 8-30 sinuous or crenulated lips; with 8 or more radial canals, simple, ramified, or in clusters of 4; up to 64 marginal tentacles, laterally compressed; no marginal cirri, but numerous filiform tentaculiform structures devoid of marginal bulbs, not in contact with circular canal, in each intertentacular space (Cordylus); gonads usually on proximal parts of radial canals; numerous (up to 800) adaxial ocelli; no statocysts or cordyli; without excretory pores or papillae.
Genus Orchistoma