''Chromodoris quadricolor'' is a species of very colorful sea slug, a dorid nudibranch, a marine opisthobranch gastropod mollusk.
The specific epithet ''quadricolor'' means four-colored, so-named because this nudibranch is yellow, white, blue and black in color.
Similar species: Sea Slugs
Uploaded Jul 24, 2017. Captured in Unnamed Road, 91308 Semporna, Sabah, Malaysia.