A sponge spicule (tiny needle-like structure) with two points or rays extending from a central axis.
From Greek dia- (two) + aktis (ray). Used in marine biology to describe the structural elements that make up sponge skeletons.
Sponges are basically living skeletons made of millions of these microscopic glass-like spicules—some shaped like stars, some like hooks, all with amazing geometric precision!
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