Cymbellonitzschia diluviana
Hustedt 1950 Category: Nitzschioid
BASIONYM: Cymbellonitzschia diluviana Hustedt 1950
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Pat Kociolek - February 2011
Length Range: 8.5-25 µm
Width Range: 2-4 µm
Striae in 10 µm: 22-25
Description
Valves are half-lanceolate or half-elliptical, with the keel of the raphe positioned along the straight margin, rather than along the curved convex margin. The frustule has hantzschioid symmetry. Fibulae number 8-12 in 10 µm. Striae are visible, but are not punctate.
The genus was described from African material and is based on Cymbellonitzschia minima Hustedt, a taxon which has its keel located along the arched portion of the valve, and was described for a species in Africa. Cymbellonitzschia diluviana is present in late glacial sediments and rarely in Recent lake collections in Europe (Jewson and Lowry 1993). It is difficult to imagine the symmetry and raphe organization of the African species and the northern latitude species are part of the same monophyletic group.
In the US, this species is known from large, cool, clean water lakes and is often associated with psammic habitats.
Original Description
Basionym: Cymbellonitzschia diluviana
Author: Hustedt 1950
Length Range: µm
Striae in 10 µm:
Original Description
Cymbellonitzschia diluviana ΗUST., Taf. XLI, Fig. 56-60, gleichzeitig beschrieben in meiner Abhandlung über das Interglazial von Oberohe, sie bildet die wichtigste und eigentümliche Leitform. dieses Interglazials. Im Schaalsee rezent am Westufer des Priestersees, und zwar ziemlich häufig an Ceratophyllum und auf Sand, der in dünner Schicht den schwarzen Faulschlamm überdeckt. In einem der betreffenden Präparate, das zur Kontrolle durchgezählt wurde, konnten unter einem runden Deckglas von 12 mm Durchmesser 12 Individuen festgestellt werden, das ist mindestens derselbe Häufigkeitsgrad, vielfach sogar ein höherer, den die Art in den interglazialen Sedimenten von Oberohe zeigt. Die Form ist recht auffällig, wenn auch klein, und kann kaum übersehen werden. Sie scheint im allgemeinen ausgestorben zu sein, es besteht jedoch die Μöglichkeit, daß sie in einem der weiter östlich gelegenen Seen, die mit dem Schaalsee gleichen geologischen Alters sind, ebenfalls noch rezent vorkommt.
Original Images
Cite This Page:
Kociolek, P. (2011). Cymbellonitzschia diluviana. In Diatoms of the United States. Retrieved May 23, 2013, from http://westerndiatoms.colorado.edu/taxa/species/cymbellonitzschia_diluviana
Species: Cymbellonitzschia diluviana
Contributor: Pat Kociolek
Reviewer: Mark Edlund
Image Credit: Pat Kociolek
- Valves half-lanceolate
- Raphe positioned along the straight margin
Valves half-lanceolate or half-elliptical, with the keel of the raphe positioned along the straight margin, rather than along the curved margin.
Compare
This symmetry of this keel-bearing diatom make it hard to confuse with other genera. Only a single species of this genus is present in the US flora.
Citations
Hustedt, F. (1950). Die Diatomeenflora norddeutscher Seen mit besonderer Berücksichtigung des holsteinischen Seengebiets V-VII. Seen in Mecklenburg, Lauenburg und Nordostdeutschland. Archiv für Hydrobiologie 43:329-458, Tafs 21-41.
Jewson, D.H. and Lowry, S. (1993). Cymbellonitzschia diluviana Hustedt (Bacillariophyceae): Habitat and auxosporulation. Hydrobiologia 269/270: 87-96.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
Cymbellonitzschia diluviana CAS
North American Diatom Ecological Database (NADED)
NADED ID: 24001
Autecology Discussion
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
Cymbellonitzschia diluviana
Distribution
The distribution map represents the relative abundance of this Cymbellonitzschia diluviana 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 Cymbellonitzschia diluviana was not recorded, or with a red circle indicating the relative abundance of Cymbellonitzschia diluviana.
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
Cymbellonitzschia diluviana
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.