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Amphidiscosida (sometimes spelled Amphidiscosa) is an order of hexactinellids (glass sponges). The Amphidiscosida are commonly regarded as the only living sponges in the subclass Amphidiscophora.
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spicules amphidiscs sponges megascleres living formed species often bristles families order subclass cambrian lower hexactinellids microsclere carboniferous sometimes spelled amphidiscosa
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