Craticula halophila

(Grunow ex Van Heurck) D.G.Mann in Round, R.M.Crawford and D.G.Mann 1990      Category: Symmetrical biraphid
BASIONYM: Navicula cuspidata var. halophila Grunow in Van Heurck 1885

REPORTED AS: Navicula halophila (Patrick and Reimer 1966, p. 467, plate 44, fig. 4) 

Craticula cuspidata


Craticula johnstoniae

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - October 2012
Length Range: 33-52 µm
Width Range: 8.7-12.4 µm
Striae in 10 µm: 17-19


Valves are rhombic lanceolate with acute apices, or very subtly protracted apices in small specimens. The axial area is very narrow. The central area is small and elliptic in shape. The raphe is filiform with straight, weakly expanded proximal ends and distal ends that are hooked to the same side. Striae are parallel to weakly radiate at the valve center, becoming convergent towards the apices. Areolae are fine and difficult to resolve in LM.

Original Description

Basionym: Navicula cuspidata var. halophila
Author: Grunow in Van Heurck 1885
Length Range: µm
Striae in 10 µm:

Original Description

var. halophila Grun. (Atl. Suppl. fig. 30.— in Type Ν° 12.) Etroit, très-petit : environ 5 c.d.m. ; stries délicates, 16 environ en 1 c.d.m., radiantes vers la partie moyenne, convergentes aux extrémités. Saumâtre. — Blankenberghe.

Original Images

Cite This Page:
Bahls, L. (2012). Craticula halophila. In Diatoms of the United States. Retrieved April 18, 2018, from

Species: Craticula halophila

Contributor: Loren Bahls

Reviewer: Sarah Spaulding


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

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.

Links & ID's

Index Nominum Algarum (INA)

Transfer INA

California Academy of Sciences (CAS)

Craticula halophila CAS

NCBI Genbank Taxonomy

Craticula halophila NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 21005

Autecology Discussion

Craticula halophila is widely distributed in streams acros the Northwestern Great Plains, where it prefers waters with high levels of dissolved solids (Montana Diatom Collection). There are 50 confirmed records of this taxon in the Montana Diatom Collection.

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 halophila

EMAP Response Plots

Craticula halophila

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.


- Note page for Craticula buderi

The name, Craticula halophila, was originally applied to the specimens currently shown on the page for C. buderi. That page was revised and this page was opened. - S. Spaulding