Frustulia saxonica
Rabenh. 1850 Category: Symmetrical biraphid
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Pat Kociolek | Carrie Graeff - January 2011
Length Range: 47-88 µm
Width Range: 12.5-17.5 µm
Striae in 10 µm: 30-33
Description
Valves are generally rhomboid in shape, although valves at the small end of the size range are not strongly rhomboid. The apices are slightly constricted and narrowly rounded. The longitudinal ribs are slightly curved. Both the thickness of the ribs and size of the central nodule are variable in relation to valve size. The porte-crayon is relatively small. Striae are radiate the apices. Longitudinal striae are present, but may be disorganized at the valve center.
Original Description
Basionym:
Author: Rabenh. 1853
Length Range: µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
Kociolek, P., and Graeff, C. (2011). Frustulia saxonica. In Diatoms of the United States. Retrieved April 22, 2018, from http://westerndiatoms.colorado.edu/taxa/species/frustulia_saxonica
Species: Frustulia saxonica
Contributor: Pat Kociolek | Carrie Graeff
Reviewer: Sarah Spaulding
Image Credit: Carrie Graeff
- Valve shape variable
- Apices slightly constricted
- Porte-crayon relatively small
The degree of rhomboid valve shape is variable within populations, in direct proportion to valve size. The apices are slightly constricted and a relatively small porte-crayon is present.
Compare
Frustulia saxonica is generally less robust than F. rexii, with finer valves, more narrowly rounded apices, thinner longitudinal ribs and a smaller porte-crayon. Frustulia saxonica has much more narrowly rounded apices than F. quadrisinuata, and its margins are not undulate, as the margins of F. quadrisinuata. The striae of F. saxonica are radiate at the apices, while the striae of F. krammeri and F. inculta are not radiate. Frustulia saxonica has a much higher stria density than that of F. krammeri (24-26 in 10 microns). Frustulia saxonica has relatively shorter helictoglossae than F. inculta, so that the porte-crayon appears smaller in F. saxonica.
Frustulia rexii
Frustulia quadrisinuata
Frustulia krammeri
Frustulia inculta
Citations
Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.
Rabenhorst, L. (1848). Die Algen Sachsens. Resp. Mittel-Europa’s Gesammelt und herausgegeben von Dr. L. Rabenhorst, Dec. 1-100. No. 1-1000. Dresden. [Exsiccata, issued at various dates]. Dec. 1-100. No. 1-1000. Dresden. [Exsiccata, issued at various dates].
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
NCBI Genbank Taxonomy
North American Diatom Ecological Database (NADED)
NADED ID: 35025
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
Frustulia saxonica
Distribution
The distribution map represents the relative abundance of this Frustulia saxonica 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 Frustulia saxonica was not recorded, or with a red circle indicating the relative abundance of Frustulia saxonica.
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
Frustulia saxonica
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.