Goniobranchus tumulifera

Seen in the area of Sihanoukville, Cambodia (May, 2011).
Chromodoris tumuliferus is a chromodorid nudibranch with a translucent white mantle and large, carmine-red spots. There is a submarginal line at edge of the mantle which is yellow, either continuous or broken into yellow blotches, with a translucent or white extreme edge. In this outer margin there may be more red blotches or an almost continuous red margin.