Pyrosomes are pelagic Tunicates, which are part of Chordata, a phylum that includes humans. It is tough and slimy to the touch with small, pronounced bumps. Inside the wall of this gelatinous tube, which can get up to 60 cm, individual zooids are tightly packed together. These zooids have an incurrent and excurrent siphon and use cilia to pump water for feeding, respiration and movement. Using a mucus net, they filter water for small planktonic microorganisms.Pyrosomes are known to aggregate in large clusters at the surface and the zooids bioluminesce to create beautiful light displays.
June 28, 2017 at 4:38 PM EDT