Grunow in Schmidt et al. 1875 Category: Asymmetrical biraphid
BASIONYM: Cymbella turgidula Grunow in Schmidt et al. 1875
Contributor: Marina Potapova -
Length Range: 27-46 µm
Width Range: 9.5-14 µm
Striae in 10 µm: 9-11 dorsal in the center valve, 12-13 at apices
Valves are slightly dorsiventral, with slightly protracted apices. The dorsal margin is strongly arched and the ventral margin is moderately convex. The central area is small and elliptical. Two (sometimes three, and rarely one or four) stigmata are present at the end of the middle striae. The proximal raphe ends have central pores that curve to the ventral margin. The raphe is lateral, becoming filiform near the distal end. Striae are radiate. The areolae are apically elongated and number 22-24 in 10 μm.
Basionym: Cymbella turgidula
Author: Grunow in Schmidt et al. 1875
Length Range: µm
Striae in 10 µm:
Krammer, K. (2002). The genus Cymbella. Diatoms of Europe. Diatoms of the European Inland Waters and Comparable Habitats 3: 1-584.
Tuji, A. (2007). Type examination and typification of Cymbella affinis Kutz., C. turgidula Grunow and C. uenoi Skvotsov. Diatom 23: 49-54.