Sponge spicule

Spicules are structural elements found in most sponges. The meshing of many spicules serves as the sponge's skeleton and thus it provides structural support and potentially defense against predators.

For other uses, see Spicule (disambiguation).
Six-pointed triaxonal siliceous spicule
from a glass sponge
Venus flower basket constructed from
similar spicules

Sponge spicules are made of calcium carbonate or silica. Large spicules visible to the naked eye are referred to as megascleres or macroscleres, while smaller, microscopic ones are termed microscleres. The composition, size, and shape of spicules are major characters in sponge systematics and taxonomy.

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