Dolioletta gegenbauri, a planktonic colonial tunicate that filters phytoplankton to eat, is about two inches (5 centimeters) long. This species was one of many collected in deep water during a Census of Marine Zooplankton (CMarZ) cruise in 2006 off the U.S. east coast. CMarZ is part of the larger project, Census of Marine Life — a 10-year…