Hilário, A., and M. R. Cunha. “On Some Frenulate Species (Annelida: Polychaeta: Siboglinidae) from Mud Volcanoes in the Gulf of Cadiz (NE Atlantic)”. Scientia Marina, vol. 72, no. 2, June 2008, pp. 361-7, doi:10.3989/scimar.2008.72n2361.