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Here's a blurry colony of Botryllus schlosseri or Harbor Star Ascidians (aka Golden Star Tunicates) growing under a large plastic fender beside a sailboat in the marina.
Here are two colors-- yellow and red-- of Botrylloides violaceus or Lined Compound Ascidian growing under a pipe off a dock in the marina. The other animals are identified separately.
Several individuals found washed up on the shore, some attached to kelp stipes. Disk detached for clearer photograph.
About 5cm. long, 5 individuals on submerged rope in Crescent Harbor, Sitka, Alaska
On submerged rope, 10 feet down, in Crescent Harbor, Sitka, Alaska
Kumejima, Okinawa, Japan
Sorry about the crummy photo
10 feet down on large boulder
Ascidiacea (commonly known as the ascidians or sea squirts) is a class in the Tunicata subphylum of sac-like marine invertebrate filter feeders. Ascidians are characterized by a tough outer "tunic" made of the polysaccharide tunicin, as compared to other tunicates which are less rigid.