Ikeda taenioides
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| Ikeda taenioides | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Annelida |
| Clade: | Pleistoannelida |
| Clade: | Sedentaria |
| Subclass: | Echiura |
| Order: | Echiuroidea |
| Family: | Ikedidae |
| Genus: | Ikeda |
| Species: | I. taenioides |
| Binomial name | |
| Ikeda taenioides | |
| Synonyms[1] | |
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Ikeda taenioides is a species of spoon worm in the family Ikedidae. It is native to the northern Pacific Ocean where it is found in the subtidal waters around Japan.
This spoon worm was first described by the Japanese zoologist I. Ikeda in 1904 as Thalassema taenioides, the type locality being Misaki, Sagami Bay, in Honshu, Japan. Examination of the musculature of the body wall led to the observation that the longitudinal muscle layer lay outside both the circular layer and the inner oblique layer, and as this was at odds with all other members of the subclass Echiura, it warranted the creation of a new order. However, examination of the original material by Teruaki Nishikawa in 2002, showed that the longitudinal muscle layer was in fact between the circular layer and the oblique layer, as in all other echurians, throwing the taxonomy of the species into doubt. Nishikawa advocates that the family Ikedidae be regarded as a junior synonym of Echiuridae.[2]