Spanish Dancer Nudibranch Portrait

A spanish dancer nudibranch (Hexabranchus sanguineus), gracefully undulates through the nighttime water off one of Maui's coastal reefs. This nudibranch has two very different modes of locomotion: crawling and swimming. When it crawls, the wide edges of the mantle are rolled up close to the body. When the animal swims however, the red edges unfurl, and are whirled through the water in a spectacular undulating motion, propelling the animal forwards.