Synedra goulardii
Brébisson ex Cleve and Grunow 1880 Category: Araphid
BASIONYM: Synedra goulardi Brébisson ex Cleve and Grunow 1880
SYNONYM(S): Fragilaria ulna var. goulardi (Brébisson) Lange-Bertalot 1980
GENUS CONSIDERED: Ulnaria
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Ian Bishop - November 2015
Length Range: 33-119 µm
Width Range: 8.5-10.5 at center; 8.6-12.4 at maximum µm
Striae in 10 µm: 9-12
Description
Valves are linear-lanceolate with a distinctly constricted mid-valve. The apices are rostrate to subcapitate, and apiculate. The axial area is linear and very narrow. The central area is large, circular, and sometimes asymmetric. Smaller specimens may have short marginal striae in the center valve. Striae are parallel, becoming slightly radiate at the apices. Ghost striae are present in the central area, although they are more visible in larger specimens. Each valve has two rimoportula, with a rimoportula positioned at each apex.
Original Description
Basionym: Synedra goulardi
Author: Brébisson ex Cleve and Grunow 1880
Length Range: 57-80 µm
Width Range: 9, 8 in the middle µm
Striae in 10 µm: 10.5
Original Description
S. Goulardi Brébisson in litteris. Schaalen in der Mitte etwas verengt, an den Enden zugespitzt, 0,057-0,080 mm. breit, in der Mitte 0,008 mm., Querstreifen 10 1/2 in 0,01 mm., an den Enden schwach radial in der Mitte auf einem fast quadratischen Raume sehr matt (bei schwacher Vergrösserung fehlend). Buenos Ayres, Portorico, Kamtschatka, Jenissey. Taf. VI, Fig. 119 200/1.
Original Images
Cite This Page:
Bishop, I. (2015). Synedra goulardii. In Diatoms of the United States. Retrieved August 23, 2017, from http://westerndiatoms.colorado.edu/taxa/species/synedra_goulardi
Species: Synedra goulardii
Contributor: Ian Bishop
Reviewer: Eduardo Morales
Image Credit: Ian Bishop
- Mid-valve constriction
- Two rimoportula per valve
- "Ghost" striae in central area
- Parallel striae, becoming radiate at ends
- Shortened, interrupted striae bordering central area
Valves are distinctly constricted at mid-valve. Striae are parallel, becoming slightly radiate at the apices. “Ghost” striae may be present in the central area. Each valve has two rimoportula, one at either end, near the apices.
Compare
Synedra goulardii is shorter than Ulnaria contracta, has a more dramatically constricted central area and more apiculate ends.
Ulnaria contracta
Citations
Cleve, P.T. and Grunow, A. (1880). Beiträge zur Kenntniss der Arktischen Diatomeen. Kongliga Svenska-Vetenskaps Akademiens Handlingar, 17(2): 121 pp., 7 pls.
Schwarzwalder, R.N. and Postek, M.T. (1981). Valve morphology of Synedra goulardi (Bacillariophyceae). Journal of Phycology 17: 412-414.
Williams, D. M. (1986). Comparative morphology of some species of Synedra Ehrenb. with a new definition of the genus. Diatom Research, 1 (1): 131-152.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 66065
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
Synedra goulardi
Distribution
The distribution map represents the relative abundance of this Synedra goulardi 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 goulardi was not recorded, or with a red circle indicating the relative abundance of Synedra goulardi.
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 goulardi
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.