Keywords: Solitary hydroid Brachyocerianthus sp. photographed on a deep-sea ridge southeast of Pearl and Hermes Atoll in the Northwestern Hawaiian Islands. worldheritagesite noaa okeanos leg2 northwesternhawaiianislands okeanosexplorer oceanexploration papahanaumokuakea papahānaumokuākea marinenationalmonument hawaiihawai‘i 2015hohonumoana |