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Diatoms of the United States is now known as Diatoms of North America.
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Pennate

Partectum

 

Periphyton

The group of bilaterally symmetric diatoms. This is a heterogeneous group that includes araphid, monoraphid, and biraphid taxa.

In older taxonomic systems, pennate diatoms are contrasted with the centric diatoms. However, these two groups are not natural, evolutionary lineages.