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Lithisida


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(class Demospongiae, subclass Tetractinomorpha)

An order of sponges which possess bulky, intertwined spicules of silica. The order is rather artificial, containing members from several orders with this type of skeleton. They are found mainly in deep water below the photic zone. They are first recorded from the Cambrian.

Subjects: Zoology and Animal Sciences.


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