Simonsenia delognei

Lange-Bert. 1979      Category: Nitzschioid
BASIONYM: Nitzschia delognei Grunow in Van Heurck 1885

Semiorbis rotundus


Spicaticribra kingstonii

LM scalebar = 10 µm = 80 pixels.


Contributor: Carrie Graeff - October 2012
Length Range: 10-15 µm
Width Range: 2.5 µm
Striae in 10 µm:


The valves are small and lanceolate or linear-lanceolate with apices that are extremely narrowly rounded and often protracted. The striae are generally biseriate but become multiseriate and disorganized near the raphe canal. The striae are not resolvable in the LM, but the presence of transapical costae gives the valves the appearance of having resolved striae. The costa density is 18 in 10 microns.

Original Description

Basionym: Nitzschia delognei
Author: Grunow in Van Heurck 1885
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Graeff, C. (2012). Simonsenia delognei. In Diatoms of the United States. Retrieved April 21, 2018, from

Species: Simonsenia delognei

Contributor: Carrie Graeff

Reviewer: Sarah Spaulding


Lange-Bertalot, H. (1979). Simonsenia, a new genus with morphology intermediate between Nitzschia and Surirella. Bacillaria 2: 127-136.

Van Heurck, H. (1885). Synopsis des Diatomées de Belgique. Texte. Martin Brouwers & Co., Anvers. p. 157. (description).

Witkowski, A., Gomes, A., Mann, D.G., Trobajo, R., Li, C., Barka, F., Gusev, E., Dąbek, P., Grzonka, J., Kurzydłowski, K.J., Zgłobicka, I., Harrison, M. and Boski, T. (2015). Simonsenia aveniformis sp. nov. (Bacillariophyceae), molecular phylogeny and systematics of the genus, and a new type of canal raphe system. Scientific Reports 5, Article: 17115 . 10.1038/srep17115

Links & ID's

Index Nominum Algarum (INA)

Transfer INA

California Academy of Sciences (CAS)

Simonsenia delognei CAS

North American Diatom Ecological Database (NADED)

NADED ID: 59001

Autecology Discussion

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

Simonsenia delognei

EMAP Response Plots

Simonsenia delognei

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.