The photo was taken from the Marshall Islands. This small flatworm is not common, but has been found under rocks on a variety of seaward, pinnacle and lagoon reefs. Patches on the flatworm looks like fried eggs.
Unfortunately, there are no more information available ablout this polyclad flatworm.
Biota > Animalia (Kingdom) > Platyhelminthes (Phylum) > Rhabditophora (Class) > Polycladida (Order) > Cotylea (Suborder) > Pseudocerotoidea (Superfamily) > Pseudocerotidae (Family) > Pseudoceros (Genus)