Diatoma mesodon

Kützing 1844      Category: Araphid
BASIONYM: Diatoma mesodon Kützing 1844

Diatoma ehrenbergii


Diatoma moniliformis

LM scalebar = 10 µm = 80 pixels.


Contributor: Marina Potapova - May 2009
Length Range: 10-40 µm
Width Range: 6–12 µm
Striae in 10 µm: 25-35


Frustules are rectangular in girdle view. Valves are elliptical-lanceolate with broadly rounded ends, 6-12 µm wide, 10-40 µm long. Transapical ribs are 3-6 in 10 µm. Striae are uniseriate, consisting of small poroid areolae, 25-35 in 10 µm. The axial area is linear, very narrow. One rimoportula is present at one valve apex. Apical pore fields are present at both apices.

Original Description

Basionym: Diatoma mesodon
Author: Kützing 1844
Length Range: µm
Striae in 10 µm:

Original Description

D. articulis oblongis medio paucidentatis, a latere secundario ventricoso lanceolatis, striis transversalibus mediis 3 - 4.

Original Images

Cite This Page:
Potapova, M. (2009). Diatoma mesodon. In Diatoms of the United States. Retrieved August 21, 2017, from http://westerndiatoms.colorado.edu/taxa/species/Diatoma_mesodon

Species: Diatoma mesodon

Contributor: Marina Potapova

Reviewer: Sam Rushforth


Bishop, I.W. and Spaulding, S.A. (2015). Tetracyclus hinziae (Bacillariophyta), a new species from the central Cascade Mountains (WA, USA). Phytotaxa 205(3): 197-204. 10.11646/phytotaxa.205.3.7

Kützing, F.T. (1844). Die kieselschaligen Bacillarien oder Diatomeen. Nordhausen. 152 pp., 30 pls.

Williams, D.M. (1985). Morphology, taxonomy and inter-relationships of the ribbed araphid diatoms from the genera Diatoma and Meridion (Diatomaceae: Bacillariophyta). Bibliotheca Diatomologica 8: 1-228.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Diatoma mesodon CAS

North American Diatom Ecological Database (NADED)

NADED ID: 27002

Autecology Discussion

Cold water species

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

Diatoma mesodon

EMAP Response Plots

Diatoma mesodon

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.