Some polynoid polychaetes found living commensally in mantle cavities of deep-sea mussels at the seep-sites near the Florida Escarpment, are described as a new species of
Branchipolynoe,
B. seepensis. They show some differences from the previously described
B. symmytilida, commensal with deep-sea mussels in the Galapagos hydrothermal vents.