An order of diatoms (single-celled algae) within the larger classification of diatom organisms; a major group of microscopic algae.
From bacillaria (diatom genus) plus -ales (Latin suffix for orders in biological classification). The -ales ending indicates a taxonomic order, as in Rosales or Carnivales.
Bacillariales contains billions upon billions of diatoms that will never be individually named—it's a reminder that taxonomy is ultimately a human organizational tool we impose on nature, and entire orders of organisms are classified by suffixes scientists added to Latin words almost arbitrarily.
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