A taxonomic order of marine green algae characterized by filaments with cells of different sizes (heterotrichous structure).
From 'hetero-' (different) + 'siphon-' (Greek for tube/pipe) + '-ales' (taxonomic order suffix). Named for the varied cell sizes visible in their tube-like filaments under magnification.
These algae reveal how plants developed structure—by having different-sized cells in their filaments, they created strength and specialization billions of years before animals evolved!
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