Polynoid polychaetes collected by the Mariana Back-Arc Basin Expedition in the western Central Pacific in 1987 are described. They include four new species belonging to three subfamilies and four genera of Polynoidae: Macellicephalinae:
Levensteiniella raisae; Lepidonotopodiinae:
Lepidonotopodium minutum; and Branchinotogluminae:
Branchinotogluma burkensis and
Opisthotrochopodus marianus. Included also is a brief summary of the subfamilies, genera, and species associated with deep-sea hydrothermal vents, deep seep-sites, trenches, abyssal basins, experimental deep wood panels, and caves.