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Under the Sea
Under the Sea • 1 year ago

Sponge Spicules with Spiral Sand Grain 2 Three sponge spicules surround a blue spiral sand grain. Sponge spicules are the internal skeleton of most species of sponges. They are made of silica.

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Sponge spicules. Light micrograph of the spicules from unidentified marine sponges (Porifera). Sponges are primitive multicellular animals. Spicules are the intricate skeletal structures that support the body structure of a sponge. They are made of silica or calcium. The shape of the spicules is often specific to the species of sponge, and can be used as an identification tool. Magnification: x160 at 35mm size.

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