Echiuroidea is an

order Order, ORDER or Orders may refer to: * A socio-political or established or existing order, e.g. World order, Ancien Regime, Pax Britannica * Categorization, the process in which ideas and objects are recognized, differentiated, and understood ...

annelid The annelids (), also known as the segmented worms, are animals that comprise the phylum Annelida (; ). The phylum contains over 22,000 extant species, including ragworms, earthworms, and leeches. The species exist in and have adapted to vario ...

s in the

class Class, Classes, or The Class may refer to: Common uses not otherwise categorized * Class (biology), a taxonomic rank * Class (knowledge representation), a collection of individuals or objects * Class (philosophy), an analytical concept used d ...

Polychaeta.

Families

*Suborder Bonelliida ** Bonelliidae Lacaze-Duthiers, 1858Lacaze-Duthiers, H. (1858). Recherches sur la bonellie (''Bonellia viridis'') (1). ''Annales des Sciences Naturells, Comprenant la Zoologie, la Botanique, l'Anatomie, et la Physiologie Comparées des Deux Règnes, et l'Histoire des Corps Organisés Fossiles'', 4(10), 49–110. ** Ikedidae Bock, 1942Bock, S. (1942). ''On the Structure and Affinities of ''Thalassema lankesteri'' Herdman and the Classification of the Group Echiuroidea''. Göteborg: Elanders. *Suborder Echiurida ** Echiuridae de Quatrefages, 1847de Quatrefages, M. A. (1847). Études sur les types inférieurs de l'embranchment des annelés. Mémoire sur l'Echiure de Gærtner (''Echiurus gærtnerii'' Nob.). ''Annales des Sciences Naturells, Comprenant la Zoologie, la Botanique, l'Anatomie, et la Physiologie Comparées des Deux Règnes, et l'Histoire des Corps Organisés Fossiles'', 3(7), 307–343. ** Thalassematidae Forbes & Goodsir, 1841Forbes, E. & Goodsir, J. (1841). On the natural history and anatomy of ''Thalassema'' and ''Echiurus''. ''The Edinburgh New Philosophical Journal, Exhibiting a View of the Progressive Discoveries and Improvements in the Science and the Arts'', 30, 369–378. ** Urechidae Monro, 1927Monro, C. C. A. (1927). On the families and genera of the class Echiuroidea. ''Annals and Magazine of Natural History'', 20(120), 615–620.

References

Echiurans Annelid orders {{annelid-stub