||Sandy or muddy areas dominated by members of the subphylum Urochordata, including ascidians, sea squirts, and other tunicates.
Tunicates are bag-like organisms that use incurrent and excurrent siphons for filter feeding and respiration. These animals
may be resting on the sediment surface, partially embedded in the sediment, or attached to conspecifics. On both East and
West coasts of the U.S., and in many other areas worldwide, colonies of the invasive sea squirt Didemnum are rapidly
invading and smothering local biotopes.