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The Urochordata , also referred to as Tunicates and Ascidians , are far more often called “sea squirts.”

The Urochordata , also referred to as Tunicates and Ascidians , are far more often called "sea squirts." The Urochordata , also referred to as Tunicates and Ascidians , are far more popularly known as "sea squirts." They fit in with the exact same phylum as the vertebrates although grownups would not have a backbone. A dorsal nerve cord, a dorsal stiffening structure (not composed of bone) called the notochord, and gill slits in the throat (pharynx) region during development...

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