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Microscopic view of copulatory spicule in a nematode (Eucoleus aerophilus). Bar = 50 µm
Microscopic view of spicules of sponge

Spicules are tiny spike-like structures of diverse origin and function found in many organisms, such as the copulatory spicules of certain nematodes or the grains on the skin of some frogs. In sponges, spicules perform a structural function. Spicules are a very important part of many organisms.

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