Psammothidium lauenburgianum

(Hustedt) Bukhtiyarova and Round 1996      Category: Monoraphid
BASIONYM: Achnanthes lauenburgiana Hustedt 1950

Psammothidium helveticum

 

Psammothidium levanderi

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Paul Hamilton | Marina Potapova - May 2010
Length Range: 8.0–14.0 µm
Width Range: 3.5–5.0 µm
Striae in 10 µm: 24–28

Description

Valves are elliptic to elliptic-lanceolate. The raphe valve has a linear axial area and a transversely rectangular, to bow-tie shaped central area, which is slightly asymmetric or symmetric. The raphe is straight and lacks terminal raphe fissures. The central and terminal raphe ends are simple. Internally, the central raphe ends curve toward opposite sides. The rapheless valve has a lanceolate axial area and a large, transverse, asymmetric central area with a rimmed depression on the internal valve surface. The striae are radiate on both valves. One row of areolae is present on the mantle of both valves. The external openings of the areolae are mostly isodiametric.



Original Description

Basionym: Achnanthes lauenburgiana
Author: Hustedt 1950
Length Range: 7–15 µm
Width Range: 4–5 µm
Striae in 10 µm:

Original Description

Diese neue Art wird gleichzeitig aus dem Interglazial von Oberohe in der Lüneburger Heide beschrieben. Es handelt sich also um eine Interglazialform, die im Schaalsee rezent nicht selten ist. Ich fand sie insgesamt in 13 Proben im Zarrentiner Becken, Rethwiesentief, Küchensee von Zecher, Niendorfer See, Techiner See und Borgsee, und zwar mit Ausnahme des Niendorfer Sees, wo sie im Sediment gefunden wurde, ausschlieβlich im Litoral auf verschiedenem Substrat. Sie gehört zu den Arten mit hufeisen-förmigem Fleck an einem Rande der raphenlosen Schale, der aber sowohl bei den fossilen Exemplaren von Oberohe als auch bei den rezenten oft recht matt gezeichnet ist. Die Länge der Schaalseeformen betrug etwa 7–15 μ, ihre Breite 4–5 μ.

Original Images


Cite This Page:
Hamilton, P., and Potapova, M. (2010). Psammothidium lauenburgianum. In Diatoms of the United States. Retrieved October 22, 2014, from http://westerndiatoms.colorado.edu/taxa/species/psammothidium_lauenburgianum

Species: Psammothidium lauenburgianum

Contributor: Paul Hamilton | Marina Potapova

Reviewer: Sarah Spaulding

Citations

Bukhtiyarova, L. and Round, F. E. (1996). Revision of the genus Achnanthes sensu lato. Psammothidium, a new genus based on Achnanthidium marginulatum. Diatom Research 11: 1-30.

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.

Monnier, O., Lange-Bertalot, H., Hoffmann, L. and Ector, L. (2007). The genera Achnanthidium Kützing and Psammothidium Bukhtiyarova et Round in the family Achnanthidiaceae (Bacillariophyceae): a reappraisal of the differential criteria. Cryptogamie, Algologie 28:1 41-158.

Links & ID's

Index Nominum Algarum (INA)

Original INA
Transfer INA

California Academy of Sciences (CAS)

Psammothidium lauenburgianum CAS

North American Diatom Ecological Database (NADED)

NADED ID: 186004

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

Psammothidium lauenburgianum


EMAP Response Plots

Psammothidium lauenburgianum


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.