Its green body has a Y-shaped white-to-tan marking on the head. It is commonly associated with algae in the genus Halimeda.
The body ranges from light to dark green, with white or tan spots or larger patches. A Y-shaped marking on the head runs to the bases of the rhinophores.
It is commonly associated with algae in the genus Halimeda, especially Halimeda incrassata and Halimeda monile.
An extinction-risk assessment has not been added yet.