Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Urochordata Bateson, 1885 - tunicates
       Class Thaliacea van der Haeven, 1850 - salps
         Genus Thetys Tilesius, 1802
         1 Order Pyrosomida see Order Pyrosomatida Jones, 1848
         2 Order Salpida Forbes, 1853
         3 Order Doliolida Delage & Hérouard, 1898