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 (oral) and atrial (cloacal) siphons. The water is drawn into the ascidian through the buccal siphon and leaves the atrium through the atrial siphon.
- The Tunicate Portal, an access point to the main websites and databases dealing with tunicates
- Ascidians.com, pictures of species around the world
- ANISEED, a model organism database for several ascidians species including Ciona intestinalis and Halocynthia roretzi
- JGI Ciona intestinalis v2.0, genome sequence
- View the Ciona intestinalis genome in the Ensembl genome browser .
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