Salps in Potter Pond. Probably Thalia democratica.
Dive site Outer Limits, max depth 110 ft/33.5 m.
Seen on the descent. Chain with a triangular "head."
Free floating, about 3-4 inches long.
observed 2 miles offshore at night, 35' below the surface in 1,700' of water
It was washed up on the reef. Per a marine biologist friend it is a member of large swimming tunicates called
The Thaliacea comprise a class of marine animals within the subphylum Tunicata. Unlike their bottom-dwelling relatives the ascidians, thaliaceans are free-floating for their entire lifespan. The group includes both solitary and colonial species.