a new Best of underwater Picture by Daniel Sasse. Glossodoris Atromarginata (Nudi Branch) This common species ranges in colour from creamy-white to a pale brown. It is characterized by the black line bordering the very sinuous mantle edge, the black edge to the rhinophore pockets, the black rhinophore clubs and the black edging to the simple gills.Specimens can reach 60 mm in length.