ClassificationsDiatom ActinocyclusAmphoraAsterionellaAulacoseiraBacillaria paradoxaCentric diatoms (genus unknown)CocconeisCymbellaDiatomaEncyonemaFragilariaGomphoneisGomphonemaGyrosigmaNaviculoidsStephanodiscusSynedraTabellariaUlnariaGyrosigmaGenus: GyrosigmaDiatomGyrosigma is a large sigmoidal benthic diatom.