Flimsy, apparently ridgeless nectophores each with an extensive nectosac, which has characteristically looped lateralradial canals. Both dorsal and ventral canals are sinuous. Siphosome compact sac on which the simple, bractless cormidia are borne in a spiral. Each cormidium has a single, greatly enlarged palpon, pinkish blue in colour.
Kingdom Animalia Phylum Cnidaria Class Hydrozoa Subclass Siphonophorae Order Physonectae Family Physophoridae Genus Physophora Species Physophora hydrostatica