A type of sponge spicule (tiny skeletal structure) shaped like a disc with radiating rays.
From disco- (disc) + actin (from Greek aktis, 'ray'). This is a specialized term from sponge anatomy combining Greek roots to describe the geometric shape of these microscopic structures.
Sponges have incredible microscopic architectures—these disc-shaped spicules with radiating rays look like tiny stars under a microscope, and scientists literally name them based on their geometry.
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