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DescriptionA colonial ascidian forming compact sheets. The zooids are arranged in meandering lines separated by excurrent channels which lead to a few common exhalant openings very like the oscula of sponges. Common colour forms are bright orange, pink or bright yellow, but patterned forms also occur. The exhalant openings collapse and disappear in specimens removed from the water. 4mm thick x 70mm wide sheets. Separated from Botryllus schlosseri by the meandering, linear arrangement of zooids and few exhalant openings. See also Aplidium nordmanni and Sidnyum elegans.