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a class of Chordata of the subphylum Tunicata. The saclike body of the Ascidiae is fastened to the seabed by its lower end and has two openings on its upper end—oral and cloacal. The body of the Ascidiae is clothed in a tunic, a thick membrane that has an epithelium and contains animal cellulose (tunicin). - There is a border around the image. Image size is correct. Many sizes available.
