Frustulia creuzburgensis

(Krasske) Hustedt 1957      Category: Symmetrical biraphid
BASIONYM: Navicula creuzburgensis Krasske 1927

Frustulia crassinervia

 

Frustulia inculta
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LM scalebar = 10 µm = 80 pixels.

Observations

Contributor: Carrie Graeff - February 2011
Length Range: 26.0-38.0 µm
Width Range: 6.0-8.0 µm
Striae in 10 µm: 24-26 at the center, 28-30 at the ends

Description

Valves with slightly rostrate, rounded apices, 26.0 - 38.0 µm in length by 6.0 - 8.0 µm in breadth. Valve mantle of moderate depth. The two raphe branches are arched along their entire length, resulting in asymmetrical valve face ornamentation. The distal raphe ends begin more or less centered along the longitudinal axis, and the raphe curves unilaterally toward the dorsal margin as it approaches the central area. The external proximal raphe ends are deflected in the same direction as the curve of the raphe branches. Enlarged poroids occur near the external distal raphe ends, positioned within a transverse depression. Striae are composed of rows of round, although commonly elongate, areolae. Areolae are internally occluded. The valvocopula is closed, and includes a row of projections on the internal side and a rough external notch near the center of the band. The notch is of varying size and shape and exposes a series of alternating poroids and small protuberances. In addition to the valvocopula, four open copulae are present, each with two rows of poroids.

Original Description

Basionym: Navicula creuzburgensis
Author: Krasske 1927
Length Range: 30.0-45.0 µm
Width Range: 6.0-8.0 µm
Striae in 10 µm: 18

Original Description

Original Images

Cite This Page:
Graeff, C. (2011). Frustulia creuzburgensis. In Diatoms of the United States. Retrieved May 20, 2013, from http://westerndiatoms.colorado.edu/taxa/species/frustulia_creuzburgensis

Species: Frustulia creuzburgensis

Contributor: Carrie Graeff

Reviewer: Sarah Spaulding

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Image Credit: Carrie Graeff

  1. Longitudinal ribs absent
  2. External proximal raphe ends unilaterally deflected
  3. Poroids near distal raphe ends
  4. Helictoglossae prominent

Unlike other species of Frustulia, F. creuzburgensis lacks internal longitudinal ribs. The external proximal raphe ends are unilaterally deflected, while the distal raphe ends are straight. The distal raphe ends terminate in a transverse depression that contains poroids. The helictoglossae are prominent in LM.

Compare

Frustulia creuzburgensis lacks longitudinal ribs, while F. neomundana demonstrates such ribs that extend across a portion of the valve face. In addition, F. creuzburgensis has slightly rostrate ends while F. neomundana has capitate or subcapitate ends.

Frustulia neomundana

Lange-Bertalot & Rumrich

Citations

Cholnoky, B. (1959). Neue und seltene Diatomeen aus Afrika. IV. Diatomeen aus der Kaap-Provinz. Österreichische Botanische Zeitschrift, Vol: 106, Issue: 1/2, 1-69 .

Hustedt, F. (1957). Die Diatomeenflora des Flußsystems der Weser im Gebiet der Hansestadt Bremen. Abhandlungen des Naturwissenschaftlichen Verein zu Bremen 34(3):181-440.

Krasske, G. (1927). Diatomeen deutscher Solquellen und Gradierwerke. Archiv für Hydrobiologie 18:252-272, pl. 10.

Patrick, R.M. (1959). New species and nomenclatural changes in the genus Navicula (Bacillariophyceae). Proceedings of the Academy of Natural Sciences of Philadelphia, 111, 91-108.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Frustulia creuzburgensis CAS

North American Diatom Ecological Database (NADED)

NADED ID: 35019

Autecology Discussion

Habits

Size Range

101-1000 µm3 (ie Amphora veneta)

Motility

moderately motile (e.g. Navicula tripunctata)

Attachment

Habitat

benthic

Colony

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

Frustulia creuzburgensis

Distribution

The distribution map represents the relative abundance of this Frustulia creuzburgensis 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 creuzburgensis was not recorded, or with a red circle indicating the relative abundance of Frustulia creuzburgensis.

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 creuzburgensis

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Frustulia creuzburgensis 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.