Jones, E. Ruffin, Jr.; Ferguson, Fredrick F. (1957). The genus Dinophilus (Archiannelida) in the United States. American Midland Naturalist. 57(2): 440-449.
Two new species of the archiannelid genus Dinophilus are described. Females of D. kincaidi were found in abundance in the tidal flats of Willapa Bay, Washington, but no males were observed. Nor did males appear in laboratory aquaria where worms were maintained alive for six months. This is the first archiannelid reported from the Pacific Coast of the Americas and the first dinophilid from anywhere in the Pacific so far as we know. Dinophilus jagersteni is the third archiannelid species to be reported from the Atlantic Coast of North America and all three are dinophilids. This species occurs in abundance in the vicinity of Norfolk, Virginia, and Beaufort, North Carolina. It is probable that archiannelids are much more common and widely distributed than is generally realized. However, repeated collections along both the Atlantic and Gulf Coasts of Florida, have failed to produce any archiannelids in this area to date.