With 4 interradial gonads encircling manubrium but interrupted in perradial corners; no gonads on radial canals. Umbrella up to 16 mm wide; manubrium simple, tubular; about 120 tentacles; statocysts unknown.
Kingdom Animalia Phylum Cnidaria Subphylum Medusozoa Superclass Hydrozoa Class Hydroidomedusae Subclass Trachymedusae Family Rhopalonematidae Genus Arctapodema Species Arctapodema antarctica
