Valves nearly rhombus, smoothly rounded in the middle, cuneate (wedge-shaped) at the apices (endings).
Cells can measure from 33 - 45 ?m in length and 9 - 27 um in width with wide.
Striae (row of areolae) appear in a single row (uniseriate) on valves (ARV and RV) with 8 - 9 striae in 10 um.
Transapical striae nearly linear or slightly radial.
Cells with the marginal ridge and spines on the both terminal ends of the valve.
Marine littoral diatom found on rocky shores.
* Information compiled by Mr Pumlile Cotiyane
Kociolek, J. P.; Balasubramanian, K.; Blanco, S.; Coste, M.; Ector, L.; et al. 2019 DiatomBase. Achnanthes yaquinensis McIntire & Reimer, 1974. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=621484 on 2019-03-12
Lee, S.; Park, J. S. and Lee, J. H. 2013 Taxonomic study of the genus Achnanthes (Bacillariophyta) in Korean coastal waters.36:391-406
McIntire, C. D. and Reimer, C. W. 1974 Some marine and brackish-water Achnanthes from Yaquina Estuary, Oregon (U.S.A.).17:164-175