Amphicampa
(Ehrenberg) Ralfs in Pritchard 1861 Category: Eunotioid
TYPE SPECIES: Amphicampa alata (Ehrenberg) Ralfs in Pritchard
CLASS: Bacillariophyceae
ORDER: Eunotiales
FAMILY: Eunotiaceae
- Valve asymmetrical to the apical axis, symmetrical to transapical axis
- Dorsal and ventral margins distinctly undulate
- Raphe short, restricted to the valve ends
Amphicampa is asymmetrical to the apical axis and symmetrical to transapical axis. Both the dorsal and ventral margins of the valves are undulate. The raphe is very short and may only be visible through the thickening of the helictoglossa.
A single species, A. eruca Ehrenberg, is found in circumneutral to alkaline waters in the midwest and western United States. This species has also been found in subfossil pothole deposits in Iowa (Julius, unpublished data).
Cite This Page:
Spaulding, S., and Edlund, M. (2009). Amphicampa. In Diatoms of the United States. Retrieved May 19, 2013, from http://westerndiatoms.colorado.edu/taxa/genus/Amphicampa
Contributor: Sarah Spaulding | Mark Edlund - January 2009
Citations
Kociolek, J.P. (2000). Valve ultrastructure of some Eunotiaceae (Bacillariophyceae), with comments on the evolution of the raphe system. Proc. Calif. Acad. Sci. Occasional Proceed., 4th series, 52: 11-21.
Kolbe, R.W. (1956). Zur Phylogenie des Raphe-Organs der Diatomeen: Eunotia (Amphicampa) eruca Ehr. Bot. Not. 109: 91-97.
Mann, D.G., Chepurnov, V.A. and Idei, M. (2003). Mating system, sexual reproduction, and auxosporulation in the anomalous raphid diatom Eunotia (Bacillariophyta). Journal of Phycology 39: 1067-1084. 10.1111/j.0022-3646.2003.03-011.x