carbon cycle. Taxonomy The class is a relatively small one, and is divided into three orders: Class Thaliacea Order Pyrosomida Jones 1848 Family Pyrosomatidae Garstang 1929 Subfamily Pyrostremmatinae van Soest 1979 Genus Pyrostremma Garstang 1929 [Propyrosoma Ivanova-Kazas 1962] Subfamily Pyrosomatinae Genus Pyrosoma Péron 1804 [Dipleurosoma Brooks 1906] Genus Pyrosomella van Soest 1979 Order Salpida [Hemimyaria; Desmomyaria Uljanin 1884] Family Salpidae Franstedt 1885 Subfamily Cyclosalpinae Yount 1954 Genus Cyclosalpa Blainville 1827 [Orthocoela Macdonald 1864; Pyrosomopsis Macdonald 1864] Genus Helicosalpa Todaro 1902 Subfamily Salpinae Lahille 1888 Genus Brooksia Metcalf 1918 Genus Iasis Savigny 1816 [Weelia Yount 1954; Salpa (Iasis) Savigny 1816] Genus Ihlea Metcalf 1919 non Metcalf 1918 [Apsteinia Metcalf 1918 non Schmeil 1894] Genus Metcalfina Ihle & Ihle-Landenberg 1933 Genus Pegea Savigny 1816 Genus Ritteriella Metcalf 1919 [Ritteria Metcalf 1918 non Kramer 1877] Genus Salpa Forskål 1775 [Biphora Bruguière 1789; Bifora Agassiz 1846; Dagysa Banks & Solander 1773] Genus Soestia [Holothurium sensu Pallas 1774] Genus Thetys Tilesius 1802 [Salpa (Thetys) Tilesius 1802] Genus Thalia Blumenbach 1798 [Dubreuillia Lesson 1832; Edusa Gistl 1848] Genus Traustedtia Metcalf 1918 [Salpa (Traustedtia) Metcalf 1918] Order Doliolida [Cyclomyaria Uljanin 1884] Suborder Doliolidina Family Doliolidae Bronn 1862 Genus Dolioletta Borgert 1894 Genus Doliolina Garstang 1933 Genus Dolioloides Garstang 1933 Genus Doliolum Quoy & Gaimard 1834 Family Doliopsoididae Godeaux 1996 Genus Doliopsoides Krüger 1939 Suborder Doliopsidina Family Doliolunidae Robison, Raskoff & Sherlock 2005 Genus Pseudusa Robison, Raskoff & Sherlock 2005 Family Doliopsidae Godeaux 1996 Genus Doliolula Robison, Raskoff & Sherlock 2005 Genus Doliopsis Vogt 1854 Family Paradoliopsidae Godeaux 1996 Genus Paradoliopsis Godeaux 1996 References External links earthlife.net amonline.net.au ascidians.com Chordate classes