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Ascidiacea

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Sea Squirts / Silke Baron, Flickr

Urn Ascidian (Didemnum molle) - a type of tunicate, or sea squirt

Silke Baron, Flickr
Definition: Ascidiacea is the class of organisms that contains the sessile tunicates, or sea squirts. These animals are in the Phylum Chordata, and subphylum Urochordata. They are sometimes referred to as ascidians.
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