Ceratosoma palliolatum is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.
Ceratosoma palliolatum lacks the prominent dorsal horn found in species such as C. trilobatum, but the body is relatively high and firm to touch. The gills are characteristically long with few lamellae. Thye are almost invisible in the accompanying photos because their colour matches the colour of the mantle. The rhinophores are tipped in purple. The body is a mottled orange with scattered purple spots around the mantle edge.
This species is a common reef inhabitant reaching 7,5 cm in length.
Like many chromodorids, the aposomatically colored Ceratosoma have mantle glands producing pungent noxious secretions used in their defense against predators.