Discostella pseudostelligera

(Hustedt) Houk and Klee 2004      Category: Centric
BASIONYM: Cyclotella pseudostelligera Hustedt 1939

Diprora haenaensis

 

Discostella stelligera

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Rex Lowe - January 2015
Diameter: 3.7-6.5 µm
Rows of areolae in 10 µm: 22-24

Description

Valves may be flat, or may have a convex or concave center. Valves have a distinct central area with a stellate or “floral” pattern of elongate or puncta-like areolae. The central area is surrounded by a marginal ring of radiate striae. The radiate striae may be bifurcated by ribs, or may have an irregular radiate pattern due to insertion of shorter striae near the valve margin. The marginal fultoportulae have expanded, hood-like external projections. These structures may be spaced on every 3 to 7 ribs. The marginal fultoportulae are best observed by fine focusing (optically dissecting) the valve. The central stellate areolae may not be present on all specimens; specimens with such morphology are sometimes referred to Discostella woltereckii Hustedt (Belcher et al. 1966).



Original Description

Basionym: Cyclotella pseudostelligera
Author: Hustedt 1939
Diameter: 7-8 µm
Rows of areolae in 10 µm: 18

Original Description

Cyclotella pseudostelligera nov. spec. Schalen kreisrund, 7-8 µ im Durchmesser, nur wenig konzentrisch gewellt, fast flach. Mittlefeld 1/2 des Schalendurchmessers, mit einem zentralen Ring winziger Punkte oder kurzer Striche und einem isolierten Punkt in der Mitte dieses Ringes. Randzone zart radial gestreift, Streifen etwa 18 in 10 µ, ohne Höcker oder stärkere Rippen, aber innerhalb des Schalenrand des mit einem Kranz auffallend kräftiger Dornen. Fig. 1, 2.

Original Images


Cite This Page:
Lowe, R. (2015). Discostella pseudostelligera. In Diatoms of the United States. Retrieved March 25, 2017, from http://westerndiatoms.colorado.edu/taxa/species/discostella_pseudostelligera

Species: Discostella pseudostelligera

Contributor: Rex Lowe

Reviewer: Mark Edlund, David R.L. Burge

Citations

Collins, G.B. and Kalinsky, R.G. (1977). Studies on Ohio diatoms. Bulletin of the Ohio Biological Survey, New Series 5(3). 76 pp.

Houk, V. and Klee, R. (2004). The stelligeroid taxa of the genus Cyclotella (Kutz.) Brébisson (Bacillariophyceae) and their transfer to the new genus Discostella gen. nov. Diatom Research 19: 203-228.

Houk, V., Klee, R. and Tanaka, H. (2010). Atlas of freshwater centric diatoms with a brief key and descriptions, Part III. Stephanodiscaceae A. Cyclotella, Tertiarius, Discostella. Fottea 10 (Supplement): 1-498.

Hustedt, F. (1939). Diatomeen aus der Pyrenaen. Berichte der Deutschen Botanischen Gesellschaft 56: 543-572.

Lowe, R.L. (1975). Comparative ultrastructure of the valves of some Cyclotella species (Bacillariophyceae). Journal of Phycology 11(4): 415-424.

Reavie, E.D. and Smol, J.P. (1998). Freshwater diatoms from the St. Lawrence River. Bibliotheca Diatomologica Band 41. J. Cramer, Berlin. 137 pp.

Tanaka, H. (2007). Taxonomic studies of the genera Cyclotella (Kützing) Brébisson, Discostella Houk et Klee, and Puncticulata Håkanson in the family Stephanodiscaceae Glezer et Makarova (Bacilariophyta) in Japan. Bibliotheca Diatomologica 53: 1-205.

Tuji, A. and Williams, D. (2006). The Identity of Cyclotella glomerata Bachmann and Discostella nipponica (Skvortzov) Tuji et Williams comb. et stat. nov. (Bacillariophyceae) from Lake Kizaki, Japan. Bulletin of the National Science Museum Tokyo, Series B, 32(1), pp. 9–14.

Links & ID's

Index Nominum Algarum (INA)

Original INA
Transfer INA

California Academy of Sciences (CAS)

Discostella pseudostelligera CAS

North American Diatom Ecological Database (NADED)

NADED ID: 2506002

Autecology Discussion

This species is of wide-spread occurrence and is common in the summer plankton nutrient-rich of midwestern streams.

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

Discostella pseudostelligera


EMAP Response Plots

Discostella pseudostelligera


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.