Pettibone 1989. Polynoidae and Sigalionidae (Polychaeta) from the Guaymas Basin, with descriptions of two new species, and additional records from hydrothermal vents of the Galapagos Rift, 21[degree]N, and seep-sites in the Gulf of Mexico (Florida and Louisiana). Proceedings of the Biological Society of Washington, 102(1) 1989: 154-168