Colony of individual polyps (hydranths) joined by root-like network of tubular stolons at the base. Colony shape is feather-like (pinnate). Colour: stems pale brown, hydrocladia white, gonotheca white. Up to 10 cm high.
These hydroids were distributed around the world possibly on ships. Their colonies become fertile over summer.
Sheltered bays, often on jetty piles.
Plankton or Particles
Generally not harmful but still able to sting bare skin.
Recorded in Australia
- DSE Advisory List : Not listed
- EPBC Act 1999 : Not listed
- IUCN Red List : Not listed