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Abstract
The history and characteristics of the genus Craticula are reviewed, to justify its separation from Navicula and from the Naviculaceae. Members of the genus have previously been put in Navicula sect. Orthostichae; they include such species as those formerly known as Navicula cuspidata, N. ambigua, N. perrotettii and N. halophila. The closest relatives of Craticula seem to be Stauroneis sensu stricto and the diatoms allied to “Navicula” protracta.