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Diatoms of the United States is now known as Diatoms of North America.
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Having the shape of a wedge. For example, valves of Surirella amphioxys have cuneate apices. The genera Gomphoneis and Gomphonema have species with frustules that are cuneate in girdle view.


Barber, H.G. and Haworth, E.Y. (1981). Guide to the Morphology of the Diatom Frustule. Freshwater Biological Association, 112 pp.