Geissleria kriegeri
(Krasske) Lange-Bertalot in Lange-Bertalot and Metzeltin 1996 Category: Symmetrical biraphid
BASIONYM: Navicula kriegeri Krasske 1943
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - December 2010
Length Range: 11-23 µm
Width Range: 5.0-7.5 µm
Striae in 10 µm: 16-23
Description
Valves are elliptical-lanceolate with subrostrate ends, 5.0-7.5 µm wide and 11-23 µm long. The raphe is straight and filiform. The axial area is narrow and linear. The central area is small, without isolated areolae. Striae are uniseriate, radiate, and number 16-23 in 10 µm. Areolae are apically elongated and number approximately 65-70 in 10 µm. Subpolar areolae, or annulae, are larger than areolae on other parts of the valve. The annulae form three-four rows at each pole. Note that North American specimens have slightly more drawn-out valve apices than European specimens. This morphological difference may indicate that North American “G. kriegeri” is another species.
Original Description
Basionym: Navicula kriegeri
Author: Krasske 1943
Length Range: 14-19 µm
Width Range: 6-7 µm
Striae in 10 µm: 16
Original Description
Schalen elliptisch bis lanzettlich-elliptisch mit breit gerundeten Enden. 14—19 μ lang, 6—7 μ breit. Area sehr eng, in der Mitte kaum erweitert. Streifen wenig radial, etwa 16 in 10 μ, nach den Enden enger.
Original Images
Cite This Page:
Potapova, M. (2010). Geissleria kriegeri. In Diatoms of the United States. Retrieved May 22, 2013, from http://westerndiatoms.colorado.edu/taxa/species/geissleria_kriegeri
Species: Geissleria kriegeri
Contributor: Marina Potapova
Image Credit: Marina Potapova
- Valves elliptical-lanceolate with subrostrate apices
- Central area small
- Areolae in central area absent
- Annulae in three or four rows at poles
Valves are elliptical-lanceolate with subrostrate ends, 5.0-7.5 µm wide and 11-23 µm long. The central area is small, without isolated areolae. Striae are uniseriate, radiate, and number 16-23 in 10 µm. The annulae form three-four rows at each pole.
Compare
Geissleria kriegeri differs from G. lateropunctata by smaller size and absence of isolated areolae in central area.
Geissleria lateropunctata
Citations
Krasske, G. (1943). Zur Diatomeenflora Lapplands. Bericht der Deutschen Botanischen Gessellschaft, Vol: 61, Issue: 3, 81-88.
Lange-Bertalot, H. and Metzeltin, D. (1996). Indicators of oligotrophy - 800 taxa representative of three ecologically distinct lake types, Carbonate buffered - Oligodystrophic - Weakly buffered soft water. Lange-Bertalot, H. (ed.), Iconographia Diatomologica. Annotated Diatom Micrographs. Vol. 2. Ecology, Diversity, Taxonomy. Koeltz Scientific Books. Königstein, Germany, 2:390 pp.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 210007