Cymbellonitzschia diluviana

Hustedt 1950      Category: Nitzschioid
BASIONYM: Cymbellonitzschia diluviana Hustedt 1950

Cymbella turgidula

 

Cymbopleura amphicephala
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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 April 23, 2014, from http://westerndiatoms.colorado.edu/taxa/species/cymbellonitzschia_diluviana

Species: Cymbellonitzschia diluviana

Contributor: Pat Kociolek

Reviewer: Mark Edlund

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Image Credit: Pat Kociolek

  1. Valves half-lanceolate
  2. 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)

Original INA

California Academy of Sciences (CAS)

Cymbellonitzschia diluviana CAS

North American Diatom Ecological Database (NADED)

NADED ID: 24001

Autecology Discussion

Habits

Size Range

101-1000 µm3 (ie Amphora veneta)

Motility

moderately motile (e.g. Navicula tripunctata)

Attachment

prostrate (e.g. mucilage pad)

Habitat

benthic

Colony

solitary

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

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

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Cymbellonitzschia diluviana from all the stream reaches where it was present. Note that the relative abundance scale is the same on each plot. Explanation of each environmental variable and units are as follows:

ELEVATION = stream reach elevation (meters)
STRAHLER = distribution plot of the Strahler Stream Order
SLOPE = stream reach gradient (degrees)
W1_HALL = an index that is a measure of streamside (riparian) human activity that ranges from 0 - 10, with a value of 0 indicating of minimal disturbance to a value of 10 indicating severe disturbance.
PHSTVL = pH measured in a sealed syringe sample (pH units)
log_COND = log concentration of specific conductivity (µS/cm)
log_PTL = log concentration of total phosphorus (µg/L)
log_NO3 = log concentration of nitrate (µeq/L)
log_DOC = log concentration of dissolved organic carbon (mg/L)
log_SIO2 = log concentration of silicon (mg/L)
log_NA = log concentration of sodium (µeq/L)
log_HCO3 = log concentration of the bicarbonate ion (µeq/L)
EMBED = percent of the stream substrate that is embedded by sand and fine sediment
log_TURBIDITY = log of turbidity, a measure of cloudiness of water, in nephelometric turbidity units (NTU).
DISTOT = an index of total human disturbance in the watershed that ranges from 1 - 100, with a value of 0 indicating of minimal disturbance to a value of 100 indicating severe disturbance.

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.