Craticula accomoda

(Hustedt) Mann in Round, Crawford and Mann 1990      Category: Symmetrical biraphid
BASIONYM: Navicula accomoda Hustedt 1950

Cosmioneis reimeri

 

Craticula accomodiformis

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Ian Bishop | David R.L. Burge - May 2015
Length Range: 19-20 µm
Width Range: 4.8-6.4 µm
Striae in 10 µm: 20-26

Description

Valves are linear-lanceolate, with rostrate to subcapitate, rounded apices. The axial area is narrow and the central area only slightly expanded. Striae are weakly radiate near the valve center, then parallel, becoming convergent near the apices. The raphe is filiform. The distal raphe ends are unidirectionally deflected. Areolae are not visible in LM.



Original Description

Basionym: Navicula accomoda
Author: Hustedt 1950
Length Range: 22 µm
Width Range: 7.5 µm
Striae in 10 µm: 25

Original Description

Navicula accomoda nov. spec. Schalen elliptisch-lanzettlich mit kurz geschnäbelten Enden, um 22 µ lang, etwa 7,5 µ breit. Raphe gerade, fadenförmig, mit etwas entfernt gestellten Zentralporen und kleinen, kaum unterscheidbaren Polspalten. Axialarea schmal linear, um den Zentralknoten nur sehr wenig erweitert. Transapikalstreifen durchweg senkrecht zur Mittellinie, in der Mitte, etwa 25 in 10 µ, gegen die Enden allmählich enger werdend, bis etwa 32 in 10 µ, sehr zart punktiert. Taf. XXXIX, Fig. 17, 18.

Charemsee, sehr selten.

Die Art hat gewisse Ähnlichkeiten mit Navicula halophila (GRUN.) CLEVE und N. simplex KRASSKE, unterscheidet sich aber von beiden Formen durch die im mittleren Teil der Schalen entfernter stehenden Streifen, von N. simplex auch durch die Richtung besonders der Polstreifen.

Während des Druckes dieser Arbeit wurde die Art von weiteren Standorten bebannt: MAX MÖLLER (Odense) fand sie auf Fünen, MESSIKOMMER stellte sie in der Schweiz fest (massenhaft, fast rein, in einer Probe aus dem Hemmentaler Bach, Kanton Schaffhausen) und mein Schuler stud. ret. nat. MARTIN SCHEELE fand sie in der Fulda. Das Material von den genannten Standorten hat mir zur Nachprüfung vorgelegen.

Original Images


Cite This Page:
Bishop, I., and Burge, D. (2015). Craticula accomoda. In Diatoms of the United States. Retrieved October 22, 2017, from http://westerndiatoms.colorado.edu/taxa/species/craticula_accomoda

Species: Craticula accomoda

Contributor: Ian Bishop | David R.L. Burge

Reviewer: Kalina Manoylov

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.

Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.

Round, F.E., Crawford, R.M. and Mann, D.G. (1990). The Diatoms. Biology and Morphology of the Genera. Cambridge University Press, Cambridge, 747 pp.

Simonsen, R. (1987). Atlas and Catalogue of the Diatom Types of Friedrich Hustedt. J. Cramer, Berlin & Stuttgart 1: 525 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Craticula accomoda CAS

NCBI Genbank Taxonomy

Craticula accomoda NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 21003

Autecology Discussion

Images

Distribution of Craticula accomoda in continental U.S. rivers in the National Water Quality Assessment program. Retrieved 03 June 2015.

Credit/Source: USGS BioData

Distribution of Craticula accomoda in Alaskan rivers in the National Water Quality Assessment program. Retrieved 03 June 2015.

Credit/Source: USGS BioData

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

Craticula accomoda


EMAP Response Plots

Craticula accomoda


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.