Comprehensive DescriptionRead full entry
Branches of the gut extend out into the cerata. The name is due to the large hood which may look like a lion's mane.
This species hunts mainly attached, but is a good swimmer (movie). When swimming it is usually upside-down, and thrashes or undulates back and forth. It is often seen swimming near the water's surface in the summer (movie), or after fall and winter storms disturb the eelgrass. Eggs are laid in long, wide yellow or cream-colored ribbons in the summer, which are attached to kelp and eelgrass. The ribbons form tight coils or wavy folds. Eggs can be found in the Washington area at any season. They appear to live about one year, reciprocally fertilize one another (as with most nudibranchs they are hermaphrodites), lay their eggs and die. This species has been used for neurological research.