This flatworm can be found (very occasionally) during the day hiding under the edge of rocks or in crevices, though it is primarily nocturnal.  All animals photographed here were found in North Kihei, Makena Landing or La Perouse Bay, Maui in less than 2 metres (6 ft) of water.  For more images and information,  check out Keoki Stender or John Hoover’s websites. Hoover does a wonderful job of explaining how these flatworms can be mistaken for two others: the False Goldrim Flatworm, or the Jebb’s Flatworm.  To about 37 mm or 1.5″.