Valves with bilateral symmetry (symmetric about a line)
Valves often asymmetrical to the apical axis
Raphe system is short and provides weak motility
Raphe located on valve mantle and face
Cells may possess 2 or more rimoportulae (labiate processes)
References
The Diatoms of the United States, Exclusive of Alaska and Hawaii: Fragilariaceae, Eunotiaceae, Achnanthaceae, Naviculacae. R Patrick, CW Reimer; 1966
Bacillariophyceae, Teil 3. Centrales, Fragilariaceae, Eunotiaceae, Achnanthaceae. K Krammer, H Lange-Bertalot, Shsswasserflora von Mitteleuropa. VEB Gustav Fisher …, 1991
Amphorotia nov. gen., a new genus in the family Eunotiaceae (Bacillariophyceae), based on Eunotia clevei Grunow in Cleve et Grunow. DM Williams, G Reid, 2006