Biology/Natural History: This species feeds on the tubedwelling anemone Pachycerianthus fimbriatus, and on Nemertean worms. Besides its radula, it has large jaws for clipping tentacles off the anemone, and leaves the anemone looking as if it has had a bad haircut. The nudibranchs are sometimes pulled into the tube when the anemone retracts, but do not seem to be harmed by this. Predators include Pycnopodia helianthoides. This nudibranch is very active (see movie) and can readily swim by gyrating the body. Eggs are laid in white strings (photo), often on the tubes of their prey. The heart of this individual was large, and the heartbeat was easily seen through the dorsal surface (see movie).