Craticula citrus

(Krasske) Reichardt 1997      Category: Symmetrical biraphid
BASIONYM: Navicula citrus Krasske 1923

Craticula buderi

 

Craticula coloradensis

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: David R.L. Burge | Ian Bishop - May 2015
Length Range: 13-17 µm
Width Range: 4.6-5.8 µm
Striae in 10 µm: 18-24

Description

Valves are lanceolate-elliptical with protracted, capitate apices. The axial area is narrow and straight. The raphe is filiform. The central area is transversely oriented and irregularly shaped. Striae are parallel throughout, with an increasing density toward the valve ends. The striae are irregularly interrupted. Areolae are coarse and and visible in LM.



Original Description

Basionym: Navicula citrus
Author: Krasske 1923
Length Range: 22 µm
Width Range: 8 µm
Striae in 10 µm: 15

Original Description

Protolog: N. Citrus nov.spec. - (Fig. 14). - Elliptisch, dünnschnabelige Enden, schmale Längs- und verbreiterte Zentralarea, Streifen grob punktiert, strahlend, die beiden mittelsten abgekürzt, die folgenden gebogen, konvexe Seite den Enden zugewandt. 15 in 10 um, Länge 22, Breite 8 um. - Fundort: Graben zqischen Fuldadamm und Karlsaue (Cassel). - Systematische Stellung noch fraglich.

Holotypus: A I 92 (Hessen), nur ein Exemplar, markiert.
Weitere Belege: Nur noch aus Formosa, E III 18 und Chile, D III 819.

Bemerkungen: Navicula citrus ist eine gut kennliche, bis jetzt jedoch noch relativ selten gefundene Art. HUSTEDT (1961 - 1966, p. 780) berichtet von einem Fund außerhalb Europas auf der Insel Luzon/Philippinen. Inzwischen sind weitere Funde in der Literatur gemeldet worden, z. B. erwähnt REICHARDT (1984, p. 42) mehrere Vokommen in der Altmuhl (Süddeutschland) bei Treuchtlingen.

Original Images


Cite This Page:
Burge, D., and Bishop, I. (2015). Craticula citrus. In Diatoms of the United States. Retrieved May 25, 2017, from http://westerndiatoms.colorado.edu/taxa/species/craticula_citrus1

Species: Craticula citrus

Contributor: David R.L. Burge | Ian Bishop

Reviewer: Kalina Manoylov

Citations

Krasske, G. (1923). Die Diatomeen des Casseler Beckens und seiner Randgebirge, nebst einigen wichtigen funden aus Niederhessen. Botanisches Archiv. Konigsberg 3(4):185-209.

Reichardt, E. (1997). Morphologie und taxonomie wenig bekannter arten aus der sammelgattung Navicula (excl. Navicula sensu stricto). Diatom Research 12(2): 299-320.

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
Transfer INA

California Academy of Sciences (CAS)

Craticula citrus CAS

North American Diatom Ecological Database (NADED)

NADED ID: 21012

Autecology Discussion

Images

Distribution of C. citrus in continental U.S. rivers as reported in the National Water Quality Assessment program. Retrieved 08 May 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 citrus


EMAP Response Plots

Craticula citrus


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.