This is a rather drab looking headshield slug, but one that is rarely seen as it prefers to bury itself in sand and is nocturnal. I only noticed it when it went flying through the water column after a goatfish disturbed the sand. A close examination reveals spiral markings on its shell and some white spots against its creamy/grey body. Apparently, it can swim by flapping its parapodia, but I just saw it hit the sand with barely a flutter. Found in about 1 metre of water in a protected fishpond in Nth Kihei. For more photos and taxonomic information, please see Sea Slugs of Hawaii.
