Attributes / relations provided by
♦ ¹Food Web Relationships of Northern Puget Sound and the Strait of Juan de Fuca : a Synthesis of the Available Knowledge, Charles A. Simenstad, Bruce S. Miller, Carl F. Nyblade, Kathleen Thornburgh, and Lewis J. Bledsoe, EPA-600 7-29-259 September 1979
♦ ²Field observations on the feeding habits of Littorina scutulata Gould and L. sitkana Philippi (Gastropoda, Prosobranchia) of southern Vancouver Island (British Columbia, Canada), Domenico Voltolina & Cesare F. Sacchi, Hydrobiologia 193: 147-154, 1990