(Grunow) Krammer 2003 Category: Asymmetrical biraphid
BASIONYM: Cymbella rupicola Grunow in Schmidt et al. 1881
Contributor: Loren Bahls - December 2012
Length Range: 30-48 µm
Width Range: 6.9-9.4 µm
Striae in 10 µm: 12 (dorsal) to 16 (ventral) at the valve center, 17-20 near the apices
Valves are only slightly dorsiventral and lanceolate to rhombic-lanceolate with weakly protracted, narrowly rounded apices. The axial area is moderately wide and merges with a somewhat wider central area to form a narrow longitudinal lanceolate shape, positioned just ventral of the apical axis. The raphe is lateral. Proximal raphe ends are somewhat inflated and deflected toward the ventral side. Terminal raphe fissures are hooked toward the dorsal side. Striae are coarsely punctate and radiate throughout. Areolae number 24-24 in 10 µm.
Basionym: Cymbella rupicola
Author: Grunow in Schmidt et al. 1881
Length Range: µm
Striae in 10 µm:
Original illustrations published without description.
Krammer, K. (2003). Cymbopleura, Delicata, Navicymbula, Gomphocymbellopsis, Afrocymbella. Diatoms of Europe. Diatoms of the European Inland Waters and Comparable Habitats 4: 1-530.
Schmidt, A. (-). (1874-1959). Atlas der Diatomaceen-Kunde, von Adolf Schmidt, continued by Martin Schmidt, Friedrich Fricke, Heinrich Heiden, Otto Muller, Friedrich Hustedt. Reprint 1984, Koeltz Scientific Books, Konigstein, 480 plates.
Cymbopleura rupicola has been collected from a seep along the Going-To-The-Sun Road in Glacier National Park, Montana, and from the Belly River in Waterton Lakes National Park, Alberta (photo below). On the date the Belly River sample was collected, pH measured 8.00, specific conductance measured 183 µS/cm, and water temperature measured 13.3 degrees C. Krammer (2003) reports this species as widely distributed in the temperate zone, especially in the mountains, and preferring oligotrophic waters with moderate electrolyte content.
Belly River below Chief Mountain Highway, Waterton Lakes National Park, Alberta: home of Cymbopleura rupicola.
Credit/Source: Barb Johnston, Parks Canada