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Hadromerida


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(class Demospongiae, subclass Tetractinomorpha)

An order of sponges in which the body has a radial structure. Spicules and organic fibres form the skeleton. The cortex is simple. Oviparous forms reproduce sexually. Some live in holes they have bored. They first appeared in the Cambrian.

Subjects: Zoology and Animal Sciences.


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