Umbrella up to 50 mm, mesoglea thick at apex; 4 tentacles; 4 lappets with numerous statocysts; 5 or 6-rayed specimens frequent.
Kingdom Animalia Phylum Cnidaria Subphylum Medusozoa Superclass Hydrozoa Class Hydroidomedusae Subclass Narcomedusae Family Aeginidae Genus Aegina Species Aegina citrea