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The Diphyidae are a family of
siphonophore Siphonophorae (from Greek ''siphōn'' 'tube' + ''pherein'' 'to bear') is an order within Hydrozoa, which is a class of marine organisms within the phylum Cnidaria. According to the World Register of Marine Species, the order contains 175 specie ...
s. These are
colonial Colonial or The Colonial may refer to: * Colonial, of, relating to, or characteristic of a colony or colony (biology) Architecture * American colonial architecture * French Colonial * Spanish Colonial architecture Automobiles * Colonial (1920 au ...
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 The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms. Content The content of the registry is edited and maintained by scientific specialis ...
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)


References

Calycophorae Cnidarian families {{Siphonophorae-stub