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 is found in the Bohai Gulf of China and along the coasts of Korea and Hokkaido. It must not be mistaken for Urechis caupo, a closely related species that is located on the western coast of North America under similar names.