Ceratosoma bicolor is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.

[2] It is possible that this species is a colour variation of Ceratosoma trilobatum[3] This species was described from Japan.

[4] Anatomically indistinguishable from Ceratosoma trilobatum but with a distinctive colour pattern.

[4][5][6]