- Ciona
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Ciona 
Ciona intestinalis Scientific classification Kingdom: Animalia Phylum: Chordata Subphylum: Tunicata Class: Ascidiacea Order: Enterogona Suborder: Phlebobranchia Family: Cionidae Genus: Ciona Species Ciona edwardsi
Ciona fascicularis
Ciona gelatinosa
Ciona imperfecta
Ciona intestinalis
Ciona mollis
Ciona savignyiCiona is a genus of Cionidae sea squirts.
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.
Genome projects
As of 2008, the genomes of Ciona intestinalis and Ciona savignyi have been sequenced.
External links
- 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
Extant Chordata classes by subphylum Kingdom Animalia · Subkingdom Eumetazoa · (unranked) Bilateria · Superphylum Deuterostomia Urochordata (Tunicates) Cephalochordata (Lancelets) Craniata 
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