This code is provided for use when identification of a specimen to this level is sufficient, or when no further detail is available.
Scientific Name Notes:
Long regarded as a distinct phylum of coelomate worms, recent genetic work has shown that the Echiura are actually derived annelids that have secondarily lost segmentation, and they are now regarded as a subclass within the Polychaeta.
Ruggiero, M.A. Gordon, D.P. Orrell, T.M. Bailly, N. Bourgoin, T. Brusca, R.C. Cavalier-Smith, T. Guiry, M.D. Kirk, P.M., 2015. A higher level classification of all living organisms., PLoS one, Vol. 10(4): 1-60. . doi:10.1371/journal.pone.0119248. doi:10.1371/journal.pone.0119248
Scientific Name verified against:
Goto, R., 2016. A comprehensive molecular phylogeny of spoon worms (Echiura, Annelida): Implications for morphological evolution, the origin of dwarf males, and habitat shifts., Molecular Phylogenetics and Evolution, Vol. 99: 247-260. . dx.doi.org/10.1016/j.ympev.2016.03.003. doi:10.1016/j.ympev.2016.03.003