Uhh... sea squirts are tunicates...  Perhaps Christy or another individual with more knowledge of biology could elaborate, but my understanding is that sea squirts are a type of ascidian which is a type of tunicate.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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