Psammothidium acidoclinatum
(Lange-Bert.) Lange-Bert. 1996 Category: Monoraphid
BASIONYM: Achnanthes acidoclinata Lange-Bert. in Lange-Bert. and Metzeltin 1996
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - August 2010
Length Range: 8-16 µm
Width Range: 4.4-5.8 µm
Striae in 10 µm: 23-27
Description
Valves are elliptic-lanceolate to linear-elliptic. The raphe valve has a linear axial area, which widens toward the center of the valve, and a transversely elliptic central area. The raphe is straight, without terminal fissures. The central and terminal raphe ends are simple. The central raphe ends curve toward opposite sides internally. The rapheless valve has a wide rhomboid-lanceolate axial area. The central area is usually not differentiated from the axial area. Striae are radiate on both valves, 23-27 in 10 µm. One row of areolae is present on the mantle of both valves. The external openings of the areolae are small, circular.
Original Description
Basionym: Achnanthes acidoclinata
Author: Lange-Bert. in Lange-Bert. and Metzeltin 1996
Length Range: 8-14(16) µm
Width Range: 4-7 µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
Potapova, M. (2010). Psammothidium acidoclinatum. In Diatoms of the United States. Retrieved April 21, 2018, from http://westerndiatoms.colorado.edu/taxa/species/psammothidium_marginulatum
Species: Psammothidium acidoclinatum
Contributor: Marina Potapova
Reviewer: Sarah Spaulding
Image Credit: Marina Potapova
- Valves elliptic-lanceolate to linear-elliptic
- Raphe valve with transversely elliptic central area
- Rapheless valve with wide rhomboid-lanceolate axial area
Valves are elliptic-lanceolate to linear-elliptic. The raphe valve has a linear axial area, which widens toward the center of the valve, and a transversely elliptic central area. The raphe is straight, without terminal fissures. The rapheless valve has a wide rhomboid-lanceolate axial area. Striae are radiate on both valves, 23-27 in 10 µm.
Compare
Psammothidium acidoclinatum differs from P. scoticum by its wider axial area on rapheless valve, elliptic-lanceolate valve shape, and lower stria density. Valves of P. altaicum are rhomboid-lanceolate with higher striae density. Psammothidium marginulatum is very similar to P. acidoclinatum, but has valves with slightly protracted apices.
Psammothidium scoticum
Psammothidium marginulatum
(Grunow) Bukht. and Round
Citations
Lange-Bertalot, H. (1999). Neue Kombinationen von taxa aus Achnanthes Bory (sensu lato). Iconographia Diatomologica 6: 276-289.
Lange-Bertalot, H. and Metzeltin, D. (1996). Indicators of oligotrophy - 800 taxa representative of three ecologically distinct lake types, Carbonate buffered - Oligodystrophic - Weakly buffered soft water. Lange-Bertalot, H. (ed.), Iconographia Diatomologica. Annotated Diatom Micrographs. Vol. 2. Ecology, Diversity, Taxonomy. Koeltz Scientific Books. Königstein, Germany, 2:390 pp.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
Psammothidium acidoclinatum CAS
North American Diatom Ecological Database (NADED)
NADED ID: 186005
Autecology Discussion
Common in soft acidic waters.
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
Psammothidium acidoclinatum
Distribution
The distribution map represents the relative abundance of this Psammothidium acidoclinatum in the western EMAP study. Relative abundance is a measure of the proportion of cells of this species based on a "fixed count" of 300 total diatom cells counted and identified. Each of the western EMAP sample sites is shown, either with a black dot for sites where Psammothidium acidoclinatum was not recorded, or with a red circle indicating the relative abundance of Psammothidium acidoclinatum.
Note that the size of the proportional symbols varies between species to help show both abundant and rare species.
Scale for the map to the left
EMAP Response Plots
Psammothidium acidoclinatum
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.
March 28, 2018 - Change in name
Prior to this date, this taxon appeared under the name Psammothidium marginulatum. It was updated to conform to Lange-Bertalot & Metzeltin (1996).