EntityQ520831· pop 19· linked from 283 articlesspiculeSign in to saveunit of the skeleton of some marine invertebrates, made of carbonate calcium or silicaConnectionsDemospongiaeEntityhexactinellidEntityPoriferaEntitysilicon dioxideEntityCalcareaEntitysynapomorphyEntityVenus' Flower BasketEntityHomosclerophoridaEntityAnimaliaEntitycellEntityboneEntityInternational Standard Book NumberEntityAdriatic SeaEntityskeletonEntityalgaeEntityfossilEntitymitochondrionEntitydigital object identifierEntitytaxonomyEntitycylinderEntityCategoriesSkeletal systemSponge anatomy