Chelyosoma productum

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Disc-top tunicate:
Disc-top tunicate (Chelyosoma productum): This species has "flaps" which seal off the siphons when closed, and at a microscopic level can be identified by the spiral rows of stigmata. It is hard when pulled out of the water, and differs from other ascidians by having a flat disc on top, which is organized in about sixteen plates (plus the siphon plates), as opposed to the twelve plates of Chelyosoma columbianum, which is described from British Columbia and the Western Pacific (Sanamyan 1998).

Also, C. columbianum has thin margins around the disk-top, and around each plate.

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