|fossil_range = {{fossil range|Upper Carboniferous|Recent|ref=<ref name="Jones1977">{{Cite journal | last1 = Jones |first1 = D. | last2 = Thompson |first2 = I. D. A. |doi = 10.1111/j.1502-3931.1977.tb00627.x |title = Echiura from the Pennsylvanian Essex Fauna of northern Illinois | journal = Lethaia | volume = 10 |issue = 4 |pages = 317 | year = 1977 |pmid = |pmc = }}</ref> }}
|image = Bonélie (Bonellia viridis) PC301461.JPG
|image caption = ''[[Bonellia viridis]]'', betina
| authority = Newby, 1940<ref>[http://onlinezoologists.com/cs/echiura Name authority]</ref>
|subdivision = * [[Echiuroidea]]
* Echiura incertae sedis
}}
'''Echiura''', atau '''cacing sendok''', adalah sekelompok kecil [[hewan]] [[laut]]. Setelah diperlakukan sebagai [[filum]] terpisah, mereka sekarang secara universal dianggap merepresentasikan cacing [[annelida]] terderivasi.<ref name="Dunn2008">{{Cite journal | last1 = Dunn |first1 = C. W. | last2 = Hejnol |first2 = A. | last3 = Matus |first3 = D. Q. | last4 = Pang |first4 = K. | last5 = Browne |first5 = W. E. | last6 = Smith |first6 = S. A. | last7 = Seaver |first7 = E. | last8 = Rouse |first8 = G. W. | last9 = Obst |first9 = M. | last10 = Edgecombe |doi = 10.1038/nature06614 |first10 = G. D. | last11 = Sørensen |first11 = M. V. | last12 = Haddock |first12 = S. H. D. | last13 = Schmidt-Rhaesa |first13 = A. | last14 = Okusu |first14 = A. | last15 = Kristensen |first15 = R. M. B. | last16 = Wheeler |first16 = W. C. | last17 = Martindale |first17 = M. Q. | last18 = Giribet |first18 = G. |title = Broad phylogenomic sampling improves resolution of the animal tree of life | journal = Nature | volume = 452 |issue = 7188 |pages = 745–749 | year = 2008 |pmid = 18322464 |pmc = }}</ref><ref name="Bourlat2008">{{Cite journal | last1 = Bourlat |first1 = S. | last2 = Nielsen |first2 = C. | last3 = Economou |first3 = A. | last4 = Telford |first4 = M. |title = Testing the new animal phylogeny: A phylum level molecular analysis of the animal kingdom |doi = 10.1016/j.ympev.2008.07.008 | journal = Molecular Phylogenetics and Evolution | volume = 49 |issue = 1 |pages = 23–31 | year = 2008 |pmid = 18692145|pmc = }}</ref><ref name="Struck2011">{{Cite journal | last1 = Struck |first1 = T. H. | last2 = Paul |first2 = C. | last3 = Hill |first3 = N. | last4 = Hartmann |first4 = S. | last5 = Hösel |first5 = C. | last6 = Kube |first6 = M. | last7 = Lieb |first7 = B. | last8 = Meyer |first8 = A. | last9 = Tiedemann |first9 = R. | last10 = Purschke |doi = 10.1038/nature09864 |first10 = G. N. | last11 = Bleidorn |first11 = C. |title = Phylogenomic analyses unravel annelid evolution | journal = Nature | volume = 471 |issue = 7336 |pages = 95–98 | year = 2011 |pmid = 21368831|pmc = }}</ref><ref name="Struck">{{Cite journal | last1 = Struck |first1 = T. H. | last2 = Schult |first2 = N. | last3 = Kusen |first3 = T. | last4 = Hickman |first4 = E. | last5 = Bleidorn |first5 = C. | last6 = McHugh |first6 = D. | last7 = Halanych |first7 = K. M. |title = Annelid phylogeny and the status of Sipuncula and Echiura |doi = 10.1186/1471-2148-7-57 | journal = BMC Evolutionary Biology | volume = 7 |pages = 57 | year = 2007 |pmid = 17411434|pmc =1855331 }}</ref> Echiura menjadi [[fosil]] dengan buruk dan diketahui spesimen awal adalah dari [[Karbon (periode)|Upper Carboniferous]] (Pennsylvanian). Namun, U-berbentuk liang fosil yang bisa merupakan Echiura telah ditemukan dari periode [[Kambrium]].
