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Naviculoid refers to diatoms in the genus Navicula or are similar in shape to Navicula. Naviculoid means "resembles Navicula", so it is not a formal term. It could refer to any diatom that is symmetric and biraphid.
A naviculoid valve margin has the shape of a boat. The genus Navicula was described in 1822 by Bory for having this shape.