Marine Wildlife Encyclopedia
Imitating Flatworm Pseudoceros imitatus
Unlike the majority of polyclad flatworms, which have a relatively smooth skin, the imitating flatworm has a bumpy surface covered in small pustules. This appearance is an imitation of the skin of the sea slug Phylidiella pustulosa, and the imitating flatworm’s color pattern is also almost identical to that of the sea slug. The sea slug secretes a noxious chemical to deter potential predators, and it may be that the imitating flatworm gains protection by looking and feeling to the touch like the distasteful sea slug.