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Diatoms of the United States is now known as Diatoms of North America.
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Lanceolate

Lacuna

 

Lateral sternum

A valve having an elongated outline, widest at the middle and tapering to both ends. Width may range from wide to narrow.


Citations

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