original description(ofEunice gracilis Moore, 1903)Moore, J.P. (1903). Polychaeta from the coastal slope of Japan and from Kamchatka and Bering Sea. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 55: 401-490, plates XXIII-XXVII., available online athttps://biodiversitylibrary.org/page/26315239 page(s): 440-441, plate XXV figs. 46-48 [details]