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Biraphid

Bifurcate

 

Biseriate

Pennate diatoms having a raphe on each valve. Examples of biraphid genera include Amphora, Epithemia, Gomphonema, Navicula, and Mastogloia. See also araphid and monoraphid.


Citations

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