Kingdom Animalia Linnaeus, 1758 - animals Phylum Hemichordata Bateson, 1885 - hemichordates Class Enteropneusta Gegenbaur, 1870 - tongue worms Genus Balanoglossus Chiaje, 1829 Genus Protoglossus van der Horst, 1935 Genus Saccoglossus Schimkewitsch, 1892