Kingdom Animalia Linnaeus, 1758 - animals Phylum Hemichordata Bateson, 1885 - hemichordates 1 Class Enteropneusta Gegenbaur, 1870 - tongue worms 2 Class Pterobranchia Lankester, 1877 - pterobranchs 3 Class Planctosphaeroidea Spengel, 1932