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Craticula buderi

(Hust.) Lange-Bert. in Rumrich et al. 2000      Category: Symmetrical biraphid
BASIONYM: Navicula buderi Hust. 1954

REPORTED AS: Navicula halophila (Krammer and Lange-Bertalot 1986, p. 126, plate 44, figs. 3-8, 14-18) | Navicula halophila (Diatoms of the US) 

Craticula ambigua


Craticula citrus

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls | Pat Kociolek - October 2012
Length Range: 24-52 µm
Width Range: 6.7-9.4 µm
Striae in 10 µm: 16-19


Valves are elliptic-lanceolate to lanceolate with short protracted rostrate apices. The axial area is very narrow. The central area is only slightly wider than the axial area and elliptic in shape. The raphe is filiform with straight, weakly expanded proximal ends and distal ends that are hooked in the same direction. Striae are parallel to weakly radiate at the valve center, becoming convergent towards the apices. Areolae are extremely fine and not easily resolved in LM.

Original Description

Basionym: Navicula buderi
Author: Hust. 1954
Length Range: 7-20 µm
Width Range: 4.5-6.5 µm
Striae in 10 µm: 17-20

Original Description

Valvae late ellipticae apicibus late rotundatis, saepissime lineares vel lineari-lanceolatae apicibus obtuse cuneatis vel rostratis, 7 bis 20 µ longae, 4,5 bis 6,5 µ latae. Rhaphe directa, filiformis, fissuris terminalibus in eadem directione curvatis. Area axialis angustissima, area centralis nulla vel minima. Striae transpicales ad lineam mediam perpendiculares, 17 bis 20 in 10 µ, striae longitudinales delicatssimae. Fig. 11 bis 15.

Original Images

Cite This Page:
Bahls, L., and Kociolek, P. (2012). Craticula buderi. In Diatoms of the United States. Retrieved May 27, 2018, from

Species: Craticula buderi

Contributor: Loren Bahls | Pat Kociolek

Reviewer: Marina Potapova


Hustedt, F. (1954). Neue und wenig bekannte Diatomeen. VI. Berichte der Deutschen Botanishen Gesellschaft 67: 269-280.

Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Süsswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.

Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.

Simonsen, R. (1987). Atlas and Catalogue of the Diatom Types of Friedrich Hustedt. J. Cramer, Berlin & Stuttgart 1: 525 pp.

Links & ID's

Index Nominum Algarum (INA)

Transfer INA

California Academy of Sciences (CAS)

Craticula buderi CAS

NCBI Genbank Taxonomy

Craticula buderi NCBI

North American Diatom Ecological Database (NADED)


Autecology Discussion

Craticula buderi is widely distributed in a variety of habitats throughout the Northwest United States, where it prefers alkaline waters with moderate levels of dissolved solids. There are 80 confirmed records of this taxon in the Montana Diatom Collection. North Widgeon Slough in Sheridan County, Montana, produced the specimens imaged here. On the sampling date, North Widgeon Slough had a pH of 8.70 and a specific conductance of 12,800 µS/cm.

EMAP Assessment

The Environmental Protection Agency (EPA) western Environmental Monitoring and Assessment Program (EMAP) study was completed during the years 2000-2004 (see citations at bottom of this page). Over 1200 streams and rivers in 12 western states (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming) were selected for sampling based on a stratified randomized design. This type of design insures that ecological resources are sampled in proportion to their actual geographical presence. Stratified randomized design also allows for estimates of stream length with a known confidence in several “condition classes” (good or least-disturbed, intermediately-disturbed, and poor or most-disturbed) for biotic condition, chemistry and habitat.

EMAP Distribution

Craticula buderi

EMAP Response Plots

Craticula buderi

EMAP citations

Results are published in:

Johnson, T., Hermann, K., Spaulding, S., Beyea, B., Theel, C., Sada, R., Bollman, W., Bowman, J., Larsen, A., Vining, K., Ostermiller, J., Petersen, D. Hargett, E. and Zumberge, J. (2009). An ecological assessment of USEPA Region 8 streams and rivers. U.S. Environmental Protection Agency Region 8 Report, 178 p.

Stoddard, J. L., Peck, D. V., Olsen, A. R., Larsen, D. P., Van Sickle, J., Hawkins, C. P., Hughes, R. M., Whittier, T. R., Lomnicky, G. A., Herlihy, A. T., Kaufman, P. R., Peterson, S. A., Ringold, P. L., Paulsen, S. G., and Blair, R. (2005). Environmental Monitoring and Assessment Program (EMAP) western streams and rivers statistical summary. U.S. Environmental Protection Agency Report 620/R-05/006, 1,762 p.

Stoddard, J. L., Peck, D. V., Paulsen, S. G., Van Sickle, J., Hawkins, C. P., Herlihy, A. T., Hughes, R. M., Kaufman, P. R., Larsen, D. P., Lomnicky, G. A., Olsen, A. R., Peterson, S. A., Ringold, P. L., and Whittier, T. R. (2005). An ecological assessment of western streams and rivers. U.S. Environmental Protection Agency Report 620/R-05/005, 49 p.


- Correction

Specimens of the morphological range shown here were originally posted on the Diatoms of the US site (J.P. Kociolek, contributor) as Craticula halophila. Further work showed that the specimens here are aligned with the type of Craticula buderi. The name of this page was changed from C. halophila to C. buderi. A new page for C. halophila was opened. - S. Spaulding