In sponge biology, a microscopic needle-shaped skeletal element; a type of sclere.
From Greek 'desma' meaning 'bond' or 'bundle,' referring to how these spicules are bundled together in certain sponge species.
Sponges are incredible—they build their entire skeleton from microscopic glass-like tubes called spicules, and 'desmas' are just one specialized type, showing nature's inventiveness in creating structural support without bones!
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