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Demospongea


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(phylum Porifera)

A class of sponges that first appears in the Cambrian. The soft tissue of the skeleton is supported by siliceous spicules, each spicule consisting of either a single ray (monaxon) or four rays (tetraxon) diverging at 60° or 120°. Most fossil species are represented by their spicules only, but they can usually be referred to modern families.

Subjects: Earth Sciences and Geography — Zoology and Animal Sciences.


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