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This is a sea squirt which is a chordate. Each of these has a rounded body with a narrower base. On the upper surface are two closely placed siphons through which water is pumped in and out at high tide and the ascidian feeds on plankton brought in by water.
Many other organisms live on the surface of the thick leathery exterior of the animal giving it a dark brown-green look. The animal is actually pink in colour.
Spotted in an intertidal rock pool with a variety of other species- southern coast of Australia.