Haplosclerida

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Haplosclerida (class Demospongiae, subclass Ceractinomorpha) An order of sponges that includes freshwater forms. If the skeleton is present it is either of siliceous spicules, or organic fibres, or both. A dermis is not common, and where it does occur it is simple. The order first appeared in the Cambrian.

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Haplosclerida

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