The Dendrodoris family of nudibranchs use a long tube through which they secrete digestive enzymes into sponges, then suck up the partially-digested sponges. This specimen, Dendrodoris tuberculosa, is named for the tubercules (rosettes) that cover its back. One scientist says its secretions are irritating to people’s eyes.

This nudibranch was photographed at night in about 35 feet of water in a lava tube off the south Kohala Coast near the Mauna Lani Resort on the Big Island of Hawaii.