Sabellastarte magnifica, the magnificent feather duster worm, is a species of marine polychaete worm in the Sabellidae family. It can be found among sandy reefs in the Caribbean. It may be included in aquariums because of its distinctive appearance and its ability to remove organic particles and improve water quality.
The magnificent feather duster worm can reach in length, with a crown as large as in diameter. It lives in a tough, leathery tube, and projects a crown of branched tentacles, or radioles, which form a plume. The radioles tend to be an orange-brown color with white tips.