Diatoms of the western USA
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BY MORPHOLOGY
Centric
Araphid
Eunotioid
Symmetrical biraphid
Monoraphid
Asymmetrical biraphid
Epithemioid
Nitzschioid
Surirelloid
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Fusiform
Fultoportula
Ghost striae
Broadest at the middle and tapering at both apices; spindle shaped.
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