Haddock, SHD, CW Dunn, and PR Pugh (2005) A reexamination of siphonophore terminology and morphology, applied to the description of two new prayine species with remarkable bio-optical properties. J. Mar. Biol. Assoc. U.K. 85:695-707. doi:10.1017/S0025315405011616 (pdf)
Dunn, CW, PR Pugh, and SHD Haddock (2005) Molecular phylogenetics of the Siphonophora (Cnidaria), with implications for the evolution of functional specialization. Systematic Biology 54:916-935. doi:10.1080/10635150500354837 (pdf)
Physalia physalis, bluebottle or Portuguese Man O’ War
On the ocean-ward beach of Bribie Island, north of Brisbane in southeast Queensland. Despite dozens of them being washed up on the surf, there were children playing in the water.
They aren’t a true jellyfish, but a siphonophore, a colonial organism, and the venom is different to jellyfish venom. Vinegar makes it worse, the best treatment is hot salt water which denatures the venom