http://en.wikipedia.org/wiki/Ascidiacea
Ascidians are found all over the world, usually in shallow water with salinities over 2.5%. While members of the Thaliacea andLarvacea swim freely like plankton, sea squirts are sessile animals: they remain firmly attached to substratum, such as rocks and shells.
Ascidians are found all over the world, usually in shallow water with salinities over 2.5%. While members of the Thaliacea andLarvacea swim freely like plankton, sea squirts are sessile animals: they remain firmly attached to substratum, such as rocks and shells.
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