Biology/Natural History: An omnivorous predator. Prey include sponges, bryozoans, sea pens,tunicates such as Aplidium californicum and Corella spp., algae, and detritus. Predators include the seastar Solaster dawsoni. Moves fairly fast for a seastar, up to 40 cm/minute. May have an internal parasitic barnacle Dendrogaster sp. In British Columbia spawns from March to May. Juveniles often congregate subtidally among tubes of the tubedwelling polychaete Phyllochaetopterus prolifica.