Haeckel, 1879 (part); Torrey, 1909
Leptomedusae with bases of manubrium attached to subumbrella along continuation of radial canals; with 4 or more simple radial canals; marginal tentacles hollow; marginal cirri present in some genera; gonads oval or linear, only on radial canals; with open statocysts.
Genus Cosmetirella
Genus Halopsis
Genus Mitrocoma
Genus Mitrocomella