Pennales is a term that refers to a group of diatoms, a class of microalgae known for their siliceous cell walls. Diatoms are unicellular organisms that play a significant role in aquatic ecosystems, serving as primary producers and forming the base of the food web. The term "Pennales" is often used to categorize the pennate diatoms, which are primarily characterized by their elongated shape and bilateral symmetry.
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