Umbrella 14 mm wide, higher than hemispherical, with rounded apex; with linear gonads extending from corners of manubrium to somewhat more than half length of radial canals; tentacles with finger-shaped or oval diverticula into bell margin; 1 (rarely 2) statocysts between successive tentacles.
Kingdom Animalia Phylum Cnidaria Subphylum Medusozoa Superclass Hydrozoa Class Hydroidomedusae Subclass Leptomedusae Order Conica Family Blackfordiidae Genus Blackfordia Species Blackfordia virginica
