Rhoicosphenia abbreviata

(Agardh) Lange-Bertalot 1980      Category: Asymmetrical biraphid
BASIONYM: Gomphonema abbreviatum Agardh 1831
SYNONYM(S): Gomphonema abbreviatum Agardh | Rhoicosphenia curvata (Kützing) Grunow 

Rexlowea navicularis

 

Rhoicosphenia californica

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Marina Potapova - May 2009
Length Range: 10–55 µm
Width Range: 4–8 µm
Striae in 10 µm: 15-20

Description

Valves are clavate. with rounded apices. Frustules are heteropolar, appearing bent in girdle view. The ventral valve is concave, with a fully developed raphe system. The dorsal valve is convex, with short raphe slits situated close to the poles. The central area is oval to elliptic. A pseudoseptum is present at both poles on valve margins. Striae are uniseriate. Areolae are apically elongated. Cells occur on stalks, forming colonies.



Original Description

Basionym: Gomphonema abbreviatum
Author: Agardh 1831
Length Range: µm
Striae in 10 µm:

Original Description

G. abbreviatum, pedunculo subramoso cymbellis conicis fastigiatis breviore.

Original Images


Cite This Page:
Potapova, M. (2009). Rhoicosphenia abbreviata. In Diatoms of the United States. Retrieved May 01, 2016, from http://westerndiatoms.colorado.edu/taxa/species/Rhoicosphenia_abbreviata

Species: Rhoicosphenia abbreviata

Contributor: Marina Potapova

Reviewer: Sam Rushforth

Citations

Agardh, C.A. (1831). Conspectus Criticus Diatomacearum. Part 3. Lundae. Litteris Berlingianis. pp. 33-48.

Lange-Bertalot, H. (1980). Ein Beitrag zur Revision der Gattungen Rhoicosphenia Grun., Gomphonema C. Ag., Gomphoneis Cl. Botaniska Notiser 133:585-594.

Mann, D.G. (1982). Structure, life history and systematics of Rhoicosphenia (Bacillariophyta) I. The vegetative cell of Rh. curvata. Journal of Phycology 18: 162-176.

Mann, D.G. (1982). Structure, life history and systematics of Rhoicosphenia (Bacillariophyta) II. Auxospore formation and perizonium structure of Rh. curvata. Journal of Phycology 18: 264-274.

Mann, D.G. (1984). Structure, life history and systematics of Rhoicosphenia (Bacillariophyta) V. Initial cell and size reduction in Rh. curvata and description of of the Rhoicospheniaceae fam. nov. Journal of Phycology 20: 544-555.

Links & ID's

Index Nominum Algarum (INA)

Transfer INA
Original INA

California Academy of Sciences (CAS)

Rhoicosphenia abbreviata CAS

North American Diatom Ecological Database (NADED)

NADED ID: 57002

Autecology Discussion

Cells are found in freshwater high in ionic content and in brackish waters.

Images

Rhoicosphenia abbreviata on Cladophora filament, Lake Okoboji, Iowa

Credit/Source: Marina Potapova

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

Rhoicosphenia abbreviata


EMAP Response Plots

Rhoicosphenia abbreviata


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.

 

- Change in species circumscription

Investigation of Rhoicosphenia in North America has resulted in recognition of species in addition to R. abbreviata. Previously, the concept presented here was broad and included R. californica. An image of R. californica was removed and the text adjusted to reflect a more narrow concept. A pdf copy of the original species page is available upon request. - S. Spaulding