Physalia

Physalia
	Physalia physalis, the Atlantic Portuguese man o' war
Scientific classification
Kingdom:	Animalia
Phylum:	Cnidaria
Class:	Hydrozoa
Order:	Siphonophorae
Suborder:	Cystonectae
Family:	Physaliidae; Brandt, 1835
Genus:	Physalia; Lamarck, 1801
Type species
	Physalia physalis; (Linnaeus, 1758)
Species
	Physalia megalista Lesueur & Petit, 1807; Physalia mikazuki Yongstar, Ochiai & Ames, 2025; Physalia minuta Church & Dunn, 2025; Physalia physalis (Linnaeus, 1758); Physalia utriculus (Gmelin, 1788);
Synonyms
	Family-level synonym Physalidae Brandt, 1835 (original spelling); ; Genus-level synonyms Arethusa Oken, 1815; Holothuria Linnaeus, 1758; Physalis Tilesius, 1810; ;

Physalia is a genus of hydrozoan cnidarians within the monotypic family Physaliidae, commonly known as man o' wars or bluebottles. They are siphonophores, colonial organisms composed of specialized individual zooids that function together as a single unit. Unlike most siphonophores, which are planktonic, Physalia species are neustonic, living at the ocean-air interface.