A general term for many diatom species that are motile, biraphid, symmetrical, and boat-shaped in valve view. Fine striae cover most of the valve. There is a thickened central sternum. A long golden-brown chloroplast is visible along each side of the valve.
Naviculoids, Waiwera River, X640. Photo: Otago Regional Council & Manaaki WhenuaNaviculoid diatom, X1600. Photo: Otago Regional Council & Manaaki Whenua
