The photo was taken from a Aquarium, Triton Bay, West Papua,2016. Similar flatworm also known from North Sulawesi, Bangka Island. Both differ in the colour of pseudotentakles.
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)