Plumularia setacea, the plumed hydroid or little sea bristle, is a colonial hydrozoan in the family Plumulariidae and is found worldwide.[1] It lives from the shore to 430m under water.
Plumed hydroids are creamy yellow to brown and have feathery stems. The stems may grow to 2 cm in total height. The reproductive bodies are smooth and oval.[2]
This species eats microplankton.[2]