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Ciona intestinalis (Linnaeus, 1767)
SUMMARY
This species is a simple, solitary ascidian, with a thin outer covering or tunic. Overall shape is cylindrical, similar to a vase. The body measures 4-15 cm in length, and attaches to the substrate at its base. The oral and atrial siphons are positioned close together at the anterior end of the body. Overall, the tunic is smooth and translucent, lacking any pigment flecks. A diagnostic red spot at the end of the sperm duct is visible through the tunic.