There are a number of species (or color varieties) of Didemnum under rocks along the lagoon reef. A site on Guam tunicates shows something very similar as a species of Polysyncraton.
There is a well camouflaged Lamellaria snail feeding on the Didemnum near the center.
This pinkish Lamellaria is leaving a trail of bare rock from which it has eaten the tunicate.
Another orange Lamellaria.
Created 31 March 2019