calcareous sponges

What Animals Have Spicules?

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What Animals Have Spicules? Spicules: structural elements found in most sponges that provide structural support, like a skeleton. Spicules can be made of silica or calcium carbonate. Do other animals have spicules? Spicules, which are present in most but not all species, may be made of silica or calcium carbonate, and vary in shape from

What Is A Sea Sponge Classified As?

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What Is A Sea Sponge Classified As? The approximately 8,550 living sponge species are scientifically classified in the phylum Porifera, which is comprised of four distinct classes: the Demospongiae (the most diverse, containing 90 percent of all living sponges), Hexactinellida (the rare glass sponges), Calcarea (calcareous sponges), and Homoscleromorpha … What group is the sea