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https://diatoms.org/images/273085
Image Neidium_amphigomphus_LA-02-b-1.jpg | Species - Diatoms of North America
https://www.diatombase.org/aphia.php?p=taxdetails&id=970904
DiatomBase - Neidium amphigomphus var. obtusum Cleve-Euler, 1955
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