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Related to Bacillariophyceae: Bacillariophyta
Bacillariophyceaethe diatoms, a class within the division Chrysophyta. They are unicellular and occur in both marine and freshwater environments; their silicified cell walls are preserved in diatomaceous earth and peat. Diatoms are one of the most important PRIMARY PRODUCERS in the sea and are responsible for the formation of petroleum deposits.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005