Ikedidae
Ikedidae is a family of spoon worms in the subclass Echiura. It is a monotypic family, the only genus being Ikeda. These worms burrow into soft sediment on the seabed. Examination of the original material of "Ikeda taenoides" by Teruaki Nishikawa in 2002, showed that the longitudinal muscle layer lay between the circular layer and the oblique layer, as in all other echurians, throwing the validity of the family Ikedidae into doubt. Nishikawa advocates that the family be regarded as a junior synonym of Echiuridae. Species. The World Register of Marine Species recognises the following species in the genus:-