Six rayed spicules are present in which species of phylum porifera..
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Three classes have Recent species: Hexactinellida (syncytial choanoderm, discrete cells and pinacoderm, siliceous triaxone spicules, ubiquitous fibrillar collagen, mostly deeper water), Demospongiae (discrete cells, siliceous monaxone or tetraxone spicules, ubiquitous fibrillar collagen), and Calcarea (discrete cells
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