Halamphora oligotraphenta
(Lange-Bertalot) Levkov 2009 Category: Asymmetrical biraphid
BASIONYM: Amphora oligotraphenta Lange-Bertalot in Lange-Bertalot and Metzeltin 1996
SYNONYM(S): Amphora veneta var. capitata Haworth 1974
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Joshua Stepanek - March 2011
Length Range: 22-33 µm
Width Range: 3.9-4.6 µm
Striae in 10 µm: 26-30 in the center, 32-34 near the poles
Description
Valves are semi-lanceolate and strongly dorsiventral, with a smoothly arched dorsal margin and a weakly concave ventral margin. The ventral margin is often slightly tumid near the central portion. The valve ends are protracted and capitate. The raphe occurs near the ventral margin, is straight and gently deflects dorsally as it nears the central area. The proximal raphe ends are widely spaced; the distal ends are deflected dorsally. The axial area is narrow throughout. A dorsal and ventral fascia are both absent. Dorsal striae are punctate and radiate throughout. Ventral striae are continuous, although often difficult to observe in light microscope.
Original Description
Basionym: Amphora oligotraphenta
Author: Lange-Bertalot in Lange-Bertalot and Metzeltin 1996
Length Range: µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
Stepanek, J. (2011). Halamphora oligotraphenta. In Diatoms of the United States. Retrieved May 24, 2013, from http://westerndiatoms.colorado.edu/taxa/species/halamphora_oligotraphenta
Species: Halamphora oligotraphenta
Contributor: Joshua Stepanek
Image Credit: Josh Stepanek
- Valve ends protracted capitate
- Dorsal striae punctate
- Proximal raphe ends widely spaced
- Striae 26-30 near middle, 32-34 near poles
Valves are semi-lanceolate and strongly dorsiventral. Valve ends are protracted and capitate.The proximal ends are widely spaced. The axial area is narrow throughout. Dorsal and ventral fascia are absent. Dorsal striae are punctate and radiate throughout. Ventral striae are continuous.
Compare
Halamphora oligotraphenta is distinguished from H. veneta by having protraccted capitate valve ends, and from H. coffeaeformis by its punctate dorsal striae, and widely spaced proximal raphe ends.
Halamphora veneta
Halamphora coffeaeformis
Citations
Haworth, E.Y. (1974). Some problems of diatom taxonomy in Scottish lake sediments. Br. Phycol. J. 9: 47-55.
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.
Levkov, Z. (2009). Amphora sensu lato. In Diatoms of Europe, Volume 5. (H. Lange-Bertalot, ed). A.R.G. Gantner Verlag K.G. 916pp.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: