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Cocconeis klamathensis

Sovereign 1958      Category: Monoraphid

Cocconeis fluviatilis


Cocconeis pediculus

LM scalebar = 10 µm = 40 pixels.


Contributor: Pat Kociolek - February 2011
Length Range: 15-44 µm
Width Range: 12-28 µm
Striae in 10 µm: 26-30


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.

Original Description

Author: Sovereign 1958
Length Range: 15-30 µm
Width Range: 13-25 µm
Striae in 10 µm: 24-29

Original Description

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.

Original Images

Cite This Page:
Kociolek, P. (2011). Cocconeis klamathensis. In Diatoms of the United States. Retrieved May 24, 2018, from

Species: Cocconeis klamathensis

Contributor: Pat Kociolek

Reviewer: Marina Potapova


Patrick, R.M. and Reimer, C.W. (1966). The Diatoms of the United States exclusive of Alaska and Hawaii, V. 1. Monographs of the Academy of Natural Sciences of Philadelphia 13.

Sovereign, H.E. (1958). The diatoms of Crater Lake, Oregon. Transactions of the American Microscopical Society 77(2):96-134.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Cocconeis klamathensis CAS

North American Diatom Ecological Database (NADED)

NADED ID: 16014

Autecology Discussion