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Haplosclerida


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(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.

Subjects: Zoology and Animal Sciences.


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