A type of sponge spicule (a tiny skeletal structure) that has three branches, all radiating from a single point.
From Greek 'dicho-' (in two) and 'triaene' (having three prongs or branches). In sponge anatomy, spicules are classified by their branching patterns, and 'dichotriaene' describes one specific three-pronged configuration.
Sponge spicules are like nature's tiny sculptures—dichotriaenes are so consistently shaped that scientists use them as a kind of 'fingerprint' to identify and classify different sponge species from ancient fossil records.
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