[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Vertebrata (Lamarck, 1801)
         Branch Urochorda
           Class Saccata
             Order Ascidiæ
               1 Genus Ascidia Linnaeus, 1767 - ascidia
               2 Genus Clavellina Savigny, 1816 see Genus Clavelina Savigny, 1816
               3 Genus Botryllus Pallas, 1774