Phyllidia willani

Phyllidia willani has a pale and granular background coloration, black lines on its dorsum that sometimes form swirls, four median notal tubercles, pale-colored foot and oral tentacles, and yellow rhinophores.

This phyllidiid nudibranch looks similar to the following related species: P. ocellata, P. babai and P. exquisita. The first is distinguishable from this species by its gold dorsum. As for the second, it has a yellow-edged mantle which is not present in this species. Same goes for the third related species.