(Auerswald) Krammer 2003 Category: Asymmetrical biraphid
BASIONYM: Cymbella naviculiformis Auerswald ex Heiberg 1863
REPORTED AS: Cymbella naviculiformis (Patrick and Reimer 1975, plate 4, fig. 9) | Cymbella naviculiformis (Krammer and Lange-Bertalot 1986, fig. 145: 6-11)
Contributor: Loren Bahls - July 2012
Length Range: 35-40 µm
Width Range: 9.1-11.4 µm
Striae in 10 µm: 10-16 at center valve, 15-19 at the ends
Valves are elliptic-lanceolate and moderately dorsiventral, with a strongly arched dorsal margin and a slightly convex to nearly flat ventral margin. Apices are rostrate to subcapitate. The axial area is narrowly lanceolate and expands gradually towards a large rounded central area. The raphe is lateral and becomes filiform near the proximal ends, which are deflected slightly towards the ventral margin. Proximal raphe ends are not expanded and tipped with short hooks. Distal raphe ends are deflected dorsally. Striae are slightly radiate throughout and somewhat more closely spaced on the ventral side. Areolae number about 35 in 10 µm.
Basionym: Cymbella naviculiformis
Author: Auerswald ex Heiberg 1863
Length Range: µm
Striae in 10 µm:
Krammer, K. (2003). Cymbopleura, Delicata, Navicymbula, Gomphocymbellopsis, Afrocymbella. Diatoms of Europe. Diatoms of the European Inland Waters and Comparable Habitats 4: 1-530.
Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.
Patrick, R.M. and Reimer, C.W. (1975). The Diatoms of the United States, exclusive of Alaska and Hawaii, V. 2. Monographs of the Academy of Natural Sciences of Philadelphia 13.
Cymbopleura naviculiformis is widely distributed in small lakes and streams in mountain regions of the Northwest United States. Here it prefers well oxygenated, circumneutral and slightly alkaline waters with low concentrations of dissolved solids (see table below). In contrast, C. amphicephala prefers waters with higher pH, alkalinity, and dissolved solids. Patrick & Reimer (1975) report Cymbella naviculiformis as widely distributed throughout the United States.
Abundance-weighted means of selected water quality variables measured concurrently with the collection of samples containing Cymbopleura naviculiformis.
Credit/Source: Montana Diatom Database
Paradise Spring Brook, Glacier National Park, Montana: home of Cymbopleura naviculiformis.
Credit/Source: Loren Bahls