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Thaliacea

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Thaliacea is a class of marine chordates within the subphylum Tunicata, comprising the salps, pyrosomes, and doliolids. Unlike their bottom dwelling relatives the ascidians, from which they are believed to have descended, thaliaceans are free floating for their entire lives, and the group includes both solitary and colonial species with complex life cycles. Their pelagic, gelatinous bodies preserve poorly, so fossils of the class are extremely rare.

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