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)