The Fuchsia Flatworm (Pseudoceros ferrugineus) is a common species observed in the open during the day. It attains 2 inches in length and appears blue or purple at depth. It is found in Hawaii and the Tropical Pacific.
Fuchsia Flatworm (Pseudoceros ferrugineus)
Fuchsia Flatworm (Pseudoceros ferrugineus)
Photo by Keoki Stender