Umbrella up to 6 mm wide and about half as high, with small apical projection; gonads globular on radial canals close to circular canal; 8 statocysts.
Kingdom Animalia Phylum Cnidaria Subphylum Medusozoa Superclass Hydrozoa Class Hydroidomedusae Subclass Trachymedusae Family Rhopalonematidae Genus Sminthea Species Sminthea eurygaster