Amalosoma Fisher, 1948 (basis of record)
Amalosoma eddystonense Stephen, 1956 (basis of record)
Anelassorhynchus Annandale, 1922 (additional source)
Anelassorhynchus indivisus (Sluiter, 1900) (basis of record)
Anelassorhynchus semoni (Fischer, 1896) (basis of record)
Bonellia Rolando, 1822 (basis of record)
Bonellia minor Marion in Rietsch, 1886 (basis of record)
Bonellia suhmii Selenka, 1885 (basis of record)
Bonellia viridis Rolando, 1822 (additional source)
Bonelliida (basis of record)
Bonelliidae Lacaze-Duthiers, 1858 (basis of record)
Echiura incertae sedis (basis of record)
Echiurida (basis of record)
Echiuridae Quatrefages, 1847 (additional source)
Echiuroidea (basis of record)
Echiurus Guérin-Méneville, 1831 (additional source)
Echiurus abyssalis Skorikow, 1906 (additional source)
Echiurus echiurus (Pallas, 1766) (additional source)
Hamingia Danielssen & Koren, 1880 (basis of record)
Hamingia arctica Danielssen & Koren, 1880 (basis of record)
Maxmuelleria Bock, 1942 (basis of record)
Maxmuelleria aulacoferum (Hérubel, 1924) (basis of record)
Maxmuelleria faex (Selenka, 1885) (basis of record)
Maxmuelleria gigas (M. Müller, 1852) (basis of record)
Maxmuelleria lankesteri (Herdman, 1897) (basis of record)
Ochetostoma Rüppell & Leuckart, 1828 (additional source)
Ochetostoma baronii (Greeff, 1872) (basis of record)
Ochetostoma erythrogrammon Rüppell & Leuckart, 1828 (basis of record)
Sactosoma Fisher, 1946 (basis of record)
Sactosoma vitreum (Danielssen & Koren, 1880) (basis of record)
Thalassema Pallas, 1774 (additional source)
Thalassema arcassonense Cuénot, 1902 (basis of record)
Thalassema elapsum Sluiter, 1912 (basis of record)
Thalassema thalassema (Pallas, 1774) (additional source)
Thalassematidae Forbes & Goodsir, 1841 (additional source)