A type of three-pronged sponge spicule (a small skeletal element) with arms or rays extending in multiple directions.
From Greek 'amphi-' (both/all around) and 'triaene' (three-pronged), describing a three-armed sponge structure.
Sponge spicules are microscopic glass-like structures—amphitriaenes look like tiny three-pointed stars under a microscope and help scientists identify sponge species.
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