Pseudobiceros damawan  Newman & Cannon, 1994

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I identified the above specimen using the South-west Indian Ocean Flatworm site, as Pseudobiceros damawan  Newman & Cannon, 1994.
Let me quote the description of Pseudobiceros damawan by Marcela Bolanos at LifeDesks:
"Mottled grey and white transparent background with some black spots scattered on the dorsal surface. The median line of the body is light orange as well as the orange marginal band which is interrupted with some white spots. Presence of a black rim dorsally and ventrally. The ventral side is cream with a mottled orange marginal band. The body is raised on the longitudinal median line, and the pseudotentacles are square and ruffled, each with two well defined groups of numerous pseudotentacular eyes. Cerebral cluster of about 50 small eyespots. Pharynx with simple folds and two male pores well separated."
There are many pictures of Pseudobiceros cf. damawan from Guam at Dave Burdick's website guamreeflife.com, this species seems to be very variable, some of Dave Burdick's specimens look pretty similar to the above specimen, others are clearly different, I guess all of them are colour variants.
There is a picture taken by me (Erwin Köhler) on November 1996 at Ellaidhoo Island, Maldives at the Marine Flatworms of the World!, and there are 2 pictures from Kenya, taken by Orietta Rivolta at Nudi Pixel, and 4 pictures from Singapore taken by Loh Kok Sheng at Ria Tan's website http://www.wildsingapore.com.