Calcarea
Calcarea
Calcarea (Calcispongea; phylum Porifera) A class of sponge, ranging from Cambrian to Recent, in which the skeleton is made entirely of calcareous spicules which are commonly of a tuning-fork shape. The sponges are sometimes associated with reefs in the Jurassic, or they may form widespread sponge beds.
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Calcareous sponges
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Calcareous sponges