Arcuatasigma is a genus of diatoms belonging to the family Pleurosigmataceae.
The genus is characterized by striae, both longitudinal and transapical, and a 180 degree twist in the frustule.
Species Accepted species: Arcuatasigma addu Arcuatasigma arenicolum Arcuatasigma belizense Arcuatasigma castracanense Arcuatasigma closterioides Arcuatasigma marginale
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