Spotted Black Flatworm, Gold-spotted Flatworm

"Body generally dark on the upperside (black to brown) with lots of little bumps that are yellow or orange tipped, as well as larger white spots. Seen from the top, it has a bluish white margin, while from the bottom it has a dark broad margin against a pale foot. It has a pair of small, erect and pointed, ear-like pseudotentacles at the front, made up of folded edges of the body."
Source: http://www.wildsingapore.com/wildfacts/worm/polycladida/acanthozoon.htm