A six-pointed star-shaped sponge spicule, a tiny skeletal structure in sponges.
From Greek 'hexa-' (six) and 'aster' (star). Zoological term for a specific type of microscopic sponge support structure.
Under a microscope, sponges look like they're made of beautiful glass stars in all different shapes—hexasters are just one of hundreds of spicule types that give sponges their strength while keeping them flexible!
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