Diphyidae

The Diphyidae are a family of siphonophores. These are colonial siphonophores with two nectophores (swimming bells) arranged one behind the other. The front one includes a somatocyst (extension of the gastrovascular system), while the hind one does not. The somatocyst often contains an oil droplet for buoyancy control. A nectosac (central cavity with muscular walls) in each nectophore allows the organism to swim efficiently.

==Systematics== The World Register of Marine Species includes the following taxa in the family Diphyidae: Subfamily Diphyinae Quoy & Gaimard, 1827 Genus Chelophyes Totton, 1932 Chelophyes appendiculata (Eschscholtz, 1829) Chelophyes contorta (Lens & van Riemsdijk, 1908) Genus Dimophyes Moser, 1925 Dimophyes arctica (Chun, 1897) Genus Diphyes Cuvier, 1817 Diphyes antarctica Moser, 1925 Diphyes bojani (Eschscholtz, 1825) Diphyes chamissonis Huxley, 1859 Diphyes dispar Chamisso & Eysenhardt, 1821 Genus Eudoxoides Huxley, 1859 Eudoxoides mitra (Huxley, 1859) Eudoxoides spiralis (Bigelow, 1911) Genus Lensia Totton, 1932 Lensia achilles Totton, 1941 Lensia ajax Totton, 1941 Lensia asymmetrica Stepanjants, 1970 Lensia campanella (Moser, 1917) Lensia challengeri Totton, 1954 Lensia conoidea (Keferstein & Ehlers, 1860) Lensia cordata Totton, 1965 Lensia cossack Totton, 1941 Lensia exeter Totton, 1941 Lensia fowleri (Bigelow, 1911) Lensia gnanamuthui Daniel & Daniel, 1963 Lensia grimaldii Leloup, 1933 Lensia hardy Totton, 1941 Lensia havock Totton, 1941 Lensia hostile Totton, 1941 Lensia hotspur Totton, 1941 Lensia hunter Totton, 1941 Lensia leloupi Totton, 1954 Lensia lelouveteau Totton, 1941 Lensia meteori (Leloup, 1934) Lensia multicristata (Moser, 1925) Lensia panikkari Daniel, 1971 Lensia quadriculata Pages, Flood & Youngbluth, 2006 Lensia subtilis (Chun, 1886) Lensia subtiloides (Lens & van Riemsdijk, 1908) Lensia zenkevitchi Margulis, 1970 Genus Muggiaea Busch, 1851 Muggiaea atlantica Cunningham, 1892 Muggiaea bargmannae Totton, 1954 Muggiaea delsmani Totton, 1954 Muggiaea kochii (Will, 1844) Subfamily Giliinae Pugh & Pages, 1995 Genus Gilia Pugh & Pages, 1995 Gilia reticulata (Totton, 1954) Subfamily Sulculeolariinae Totton, 1954 Genus Sulculeolaria Blainville, 1830 Sulculeolaria biloba (Sars, 1846) Sulculeolaria chuni (Lens & van Riemsdijk, 1908) Sulculeolaria monoica (Chun, 1888) Sulculeolaria quadrivalvis de Blainville, 1830 Sulculeolaria turgida (Gegenbaur, 1854)