Cocconeis klamathensis
Sovereign 1958 Category: Monoraphid
BASIONYM: Cocconeis klamathensis Sovereign 1958
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Pat Kociolek - February 2011
Length Range: 15-44 µm
Width Range: 13-28 µm
Striae in 10 µm: 15-16
Description
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
Basionym: Cocconeis klamathensis
Author: Sovereign 1958
Length Range: µm
Striae in 10 µm:
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 20, 2013, from http://westerndiatoms.colorado.edu/taxa/species/cocconeis_klamathensis
Species: Cocconeis klamathensis
Contributor: Pat Kociolek
Image Credit: Pat Kociolek
- Raphe valve with hyaline lines
- Areolae dash-like, offset
Valves elliptical in outline, and strongly arched about the apical axis. The raphe valve has a narrow, linear axial area. 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 on the rapheless valve.
Compare
The highly arched valves are suggestive of C. pediculus, but this species differs from C. pediculus by hyaline lines present on the raphe valve. Cocconeis klamathensis can be distinguished from C. rugosa by the more defined and uninterrupted hyaline lines present in C. klamathensis.
Cocconeis pediculus
Cocconeis rugosa
Citations
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)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 16014