Appearance
Ciona intestinalis is a solitary tunicate with a cylindrical, soft, gelatinous body, up to 20 cm long. The body colour and colour at the distal end of siphons are major external character distinguishing sister species within the species complex.
The body of Ciona is bag-like and covered by a tunic, which is a secretion of the epidermal cells. The body is attached at a permanent base located at the posterior part, and the opposite bears two openings, the buccal and atrial siphons. The water is drawn into the ascidian through the buccal (oral) siphon and leaves the atrium through the atrial siphon (cloacal).
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