Valves are ellipitic in outline and strongly arched about the apical axis. The raphe valve has a narrow, linear axial area with a filiform raphe. The proximal raphe ends are dilated slightly. The distal ends are straight and terminate subterminally. There is a small, irregular central area. A hyaline area occurs on either side of the axial area and forms a naviculoid shape. Striae are fine, punctate, and radiate. The rapheless valve has a narrowly lanceolate central sternum. The areolae are dash-like and offset from one another.
Cocconeis klamathensis sp. nov. Pl. II, Figs. 16, 17. Valvae ellipticae, valde convexae, 15-30 μ longae, 13-25 μ latae. Rhaphovalva cum elevatione longitudinali late lanceolate, rhaphe directa, filiformis, poris centralibus approximatis, fissuria terminalibus minimis ab apicibus distantibus, area axialis angustissima, area centralis transapicaliter dilatata, fasciam angustiam et marginem non attigentem formans. Striae transapicales radiantes, 24-29 in 10 μ, distincte punctatae, circiter in medio area hyalina longitudinali curvata decussatae. Areovalva area axali angustissima, area centrali minima, striae transapicales paulo vali- dores, distincte punctatae, series punctorum longitudinales irregulariter undulatae, paulo remotiores quam striae transapicales.
Kociolek, P. (2011). Cocconeis klamathensis. In Diatoms of North America. Retrieved February 19, 2025, from https://diatoms.org/species/45658/cocconeis_klamathensis