Eunotia paludosa

Grunow 1862      Category: Eunotioid
SYNONYM(S): Himantidium paludosum (Grunow) Lagerst. 1873 

Eunotia orthohedra


Eunotia panda

LM scalebar = 10 µm = 80 pixels.


Contributor: Paula Furey - March 2012
Length Range: 15-48 µm
Width Range: 2.2-3.7 µm
Striae in 10 µm: 18-22 in the center valve


Frustules are narrowly rectangular in girdle view. In valve view,valves are weakly curved. Ventral margins are straight in smaller specimens and moderately concave in mid-size to large specimens. Ventral margins of larger specimens with barely visible swellings marking the position of the proximal raphe ends (difficult to discern in smaller valves). The dorsal margins are convex. Valve apices are rounded and slightly dorsally reflexed. Helictoglossae are located close to the apices. Striae are parallel. The areolae are unresolved in the LM. Spines are absent.

Original Description

Author: Grunow 1862
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Furey, P. (2012). Eunotia paludosa. In Diatoms of the United States. Retrieved March 20, 2018, from

Species: Eunotia paludosa

Contributor: Paula Furey

Reviewer: Marina Potapova


Alles, E., Nörpel-Schempp, M. and Lange-Bertalot, H. (1991). Taxonomy and ecology of characteristic Eunotia species in headwaters with low electric conductivity. Nova Hedwigia 53: 171-213.

Grunow, A. (1862). Die österreichischen Diatomaceen nebst Anschluss einiger neuen Arten von andern Lokalitäten und einer kritischen Uebersicht der bisher bekannten Gattungen und Arten. Erste Folge. Epithemieae, Meridioneae, Diatomeae, Entopyleae, Surirelleae, Amphipleureae. Zweite Folge. Familie Nitzschieae. Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wien 12: 368, Pl. 7, fig. 8.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Eunotia paludosa CAS

North American Diatom Ecological Database (NADED)

NADED ID: 33083

Autecology Discussion

In Europe, this taxon is found in streams and is considered to be indicative of dystrophic, low pH (4) and moderate aluminum concentrations. (Alles et al. 1991). It is found in waters of specific conductance ranging 50-100 µmS. It is considered to be indifferent to sulfate concentrations.

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

Eunotia paludosa

EMAP Response Plots

Eunotia paludosa

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.