Phascolion caupo Hendrix 1975

Hendrix 1975. A review of the genus Phascolion (Sipuncula) with the descriptions of two new species from the western Atlantic. Rice, M.E.; Todorovic, M.[Eds]. Proceedings of the International Symposium on the Biology of the Sipuncula and Echiura, Kotor, June 18-25 1970. Vol. 1., Institute for Biological Research Sinisa Stankovic & National Museum Nat. Hist. Smithsonian Inst., Belgrade, 1975: 117-137. Chapter pagination: 117-137