Candelabrum cocksii is a hydrozoan (family Candelabridae) found in cold temperate and boreal seas of the North Atlantic and Arctic, forming distinctive candelabra-like hydroid colonies with tentacle-bearing hydranths arranged symmetrically around a central stem. The species inhabits hard substrates and biogenic material on the seafloor, contributing to the diverse epibenthic fauna of cold-water ecosystems. Its life history includes both a sessile hydroid and a free-swimming medusa stage. Genomic data have been generated for this species and are available in public databases, enabling comparative studies of cnidarian evolution and ecology.