Sea slugs genus Trapania feeds on Entoprocts (Kamptozoans),which often grow on sponges, algae and other living substrata.
Trapania circinata was first described from the Marshall Islands. Body is translucent white in colour. The oral tentacles and rhinophores are black and the lateral papillae and gills are translucent with black spots. Feeds on Entoprocta which often grow on sponges and other living substrata.