Synedra mazamaensis
Sovereign 1958 Category: Araphid
BASIONYM: Synedra mazamaensis Sovereign 1958
SYNONYM(S): Fragilaria mazamaensis (Sovereign) Lange-Bertalot
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - May 2009
Length Range: 12–38 µm
Width Range: 3–5 µm
Striae in 10 µm: 19-23
Description
Valves are lanceolate with attenuate and capitate ends, slightly swollen in the middle portion, width 3-5 µm, length 12-38 µm. Striae number 19-23 in 10 µm. The external openings of the areolae are apically elongated. Axial area is linear and very narrow. The central area is asymmetrical about the apical median plane, and ghost striae may be present in some specimens. One rimportula is present at a valve apex. Apical pore fields are present at both apices. The pores within the apical porefields are arranged in parallel rows.
Original Description
Basionym: Synedra mazamaensis
Author: Sovereign 1958
Length Range: 13-40 µm
Width Range: 3-5 µm
Striae in 10 µm: 19-23
Original Description
Valvae lanceolatae apicibus attenuatis, capitatis, 13-40 µ longae, 3-5 µ latae. Costa media longitudinalis (pseudoraphe) angustissima, area axialis nulla, area centralis unilateralis. Striae transapicales 19-23 in 10 µ, lenissime radiantes.
Original Images
Original text and images reproduced with permission by Blackwell Publishing.
Cite This Page:
Potapova, M. (2009). Synedra mazamaensis. In Diatoms of the United States. Retrieved June 19, 2013, from http://westerndiatoms.colorado.edu/taxa/species/Synedra_mazamaensis
Species: Synedra mazamaensis
Contributor: Marina Potapova
Reviewer: Sarah Spaulding
Image Credit: Marina Potapova
- Valves lanceolate with attenuate, capitate ends
- Central area asymmetrical
- Central margin of valve swollen
Valves are lanceolate with attenuate, capitate ends. The central valve margin is asymmetrically swollen. The central area is asymmetical.
Compare
Synedra mazamaensis is similar to Fragilaria vaucheriae, but the valve ends are distinctly attenuated and capitate in S. mazamaensis. Pseudostaurosira parasitica possesses a symmetrical central area.
Fragilaria vaucheriae
(Kützing) Peterson
Pseudostaurosira parasitica
Citations
Sovereign, H.E. (1958). The diatoms of Crater Lake, Oregon. Transactions of the American Microscopical Society 77(2):96-134.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 66062
Autecology Discussion
Freshwater
EMAP Assessment
Sampling for 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). Streams and rivers in 12 western states (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming). Over 1200 sites on 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
Synedra mazamaensis
Distribution
The distribution map represents the relative abundance of this Synedra mazamaensis 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 Synedra mazamaensis was not recorded, or with a red circle indicating the relative abundance of Synedra mazamaensis.
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
Synedra mazamaensis
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.