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Class Calcarea: (calcareous sponges). Skeleton of CaCO3 spicules , 1-4 rays

Class Demospongiae: (common sponges) Skeleton of SiO2 and/or spongin spicules, 1-4 rays

Class Hexactinellida: (glass sponges) Skeleton of SiO2 spicules, 4 and/or 6 rays

Class Homoscleromorpha: (encrusting sponges) Skeleton reduced with very small or no spicules