Acmaea Eschscholtz, 1833 (verified source for family)
Acmaea Eschscholtz, 1833 (current name source)
Bonelliida (current name source)
Cioniscus Jeffreys, 1869 accepted as Graphis Jeffreys, 1867 (verified source for family)
Cryptosomum Quatrefages, 1865 accepted as Phascolion Théel, 1875 (source of synonymy)
Dicoryne Allman, 1859 (verified source for family)
Echinosiphon Sluiter, 1883 accepted as Cloeosiphon Grube, 1868 (source of synonymy)
Echiurida (current name source)
Golfingia Lankester, 1885 (verified source for family)
Heterocordyle Allman, 1864 accepted as Dicoryne Allman, 1859 (verified source for family)
Homalosoma Örsted in Keferstein, 1865 accepted as Golfingia Lankester, 1885 (source of synonymy)
Ikeda Wharton, 1913 (verified source for family)
Leacia Johnston, 1825 accepted as Astacilla Cordiner, 1793 (source of synonymy)
Pochella Hartlaub, 1917 accepted as Trichydra Wright, 1858 (verified source for family)
Prashadus Stephen & Edmonds, 1972 (current name source)
Prashadus Stephen & Edmonds, 1972 (verified source for family)
Sactosomatidae Fisher, 1946 (extant flag source)
Sactosomatidae Fisher, 1946 (habitat flag source)
Stephanostoma Danielssen & Koren, 1880 accepted as Golfingia Lankester, 1885 (verified source for family)
Stephanostoma Danielssen & Koren, 1880 accepted as Golfingia Lankester, 1885 (source of synonymy)
Trichydra Wright, 1858 (verified source for family)
Tylosoma Koren & Daniellsen, 1875 accepted as Phascolion Théel, 1875 (source of synonymy)