Spicule

:This article is about the skeletal structure. See also Spicule (solar physics).

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Spicules are skeletal structures that appear in some types of sponges. They are made of either calcium carbonate or silica. When many are seen together, Poriferan spicules tend to look like a tightly woven mesh of stars, each having between three and six rays.

Related Topics:
Sponge - Poriferan

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