Hypselodoris sp. 10
Known only from Gulf of Oman at present
Muscat - Bandar Khairan, 12 meters, Oman, Gulf of Oman, 22 september 2006, Coral, Sea, No currents. Length: 3 cm. Photographer: Karin Stuut.
It has similarities in colour to H. dollfusi which is also found in this northern part of the Indian Ocean, and also to Ceratosoma ingozi from the SW Indian Ocean but I don't think it either of those species.