It is found in Bohai Gulf of China and off the Korean and Hokkaido coasts. It is not to be confused with a closely related species, Urechis caupo, which occurs on the western coast of North America and shares common names.
This organism exists in the Bohai Gulf of China and off the Korean and Hokkaido coasts. It should not be confused with Urechis caupo, which also occurs near the western coast of North America and shares common names.