(Grunow) Round and Basson 1997 Category: Monoraphid
BASIONYM: Achnanthidium hungaricum Grunow 1863
SYNONYM(S): Achnanthes hungarica (Grunow) Grunow in Cleve and Grunow | Achnanthidium hungaricum Grunow | Microneis hungarica (Grunow) Cleve
Contributor: Marina Potapova - August 2010
Length Range: 8-40 µm
Width Range: 4.5-7.5 µm
Striae in 10 µm: 18-24
Valves are linear to linear-elliptical with narrowed, rounded, or subrostrate apices. The raphe valve has a linear axial area and a stauros that is generally asymmetrical. The wider part of the stauros sometimes appears to have a “horse-shoe” depression. Terminal raphe fissures are short, slightly expanded, and turned toward opposite sides. Central raphe endings are drop-like externally, and curved to opposite sides internally. The rapheless valve has a narrow linear axial area and very small, often asymmetrical, irregularly shaped, transverse central area. Striae are biseriate and slightly radiate in the valve center, becoming strongly radiate at the apices, 18-24 in 10 µm . External and internal openings of areolae on the valve face are rounded to apically elongated at the valve margin. One row of elongated areolae is present on the valve mantle. Areolae are occluded by hymens internally.
Basionym: Achnanthidium hungaricum
Author: Grunow 1863
Length Range: µm
Striae in 10 µm:
Achnanthidium minutum a latere primario anguste lineare parum curvatum, valvis lineari oblongis apicibus subproductis obtusiusculis, nodulo centrali valvae inferioris lateraliter dilatato fasciam transversalem referente, striis transversis subtilibus 50 in 0.001”. Longit. 0.0007-0.0017”, latitud. lateris primar. 0.001”, latit. valvae 0.0003”. - Tab. nostr. 13 fig. 8a, b, c (400/1). Habitat ad litora meridionalia lacus Peisonis Hungariae, in lacunis parvis inter radicula Lemnarum.
Buczko, K. (2007). The occurrence of the epiphytic diatom Lemnicola hungarica on different European Lemnaceae species. Fottea 7(1): 77–84.
Garcia, M. and Fonseca de Sousa, V. (2006). Lemnicola hungarica (Grunow) Round & Basson from Southern Brazil: ultrastructure, plastid morphology, and ecology. Diatom Research 21: 465-471.
Grunow, A. (1863). Ueber einige neue und ungenügend bekannte Arten und Gattungen von Diatomaceen. Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wein. 13:137-162.
Round, F.E. and Basson, P.W. (1997). A new monoraphid diatom genus (Pogoneis) from Bahrain and the transfer of previously described species A. hungarica and A. taeniata to new genera. Diatom Research 12: 347-355.
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.
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.