Cymbella turgidula

Grunow in Schmidt et al. 1875      Category: Asymmetrical biraphid
BASIONYM: Cymbella turgidula Grunow in Schmidt et al. 1875

Cymbella tropica


Cymbellonitzschia diluviana

LM scalebar = 10 µm = 40 pixels.


Contributor: Marina Potapova - August 2011
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.

Original Description

Basionym: Cymbella turgidula
Author: Grunow in Schmidt et al. 1875
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Potapova, M. (2011). Cymbella turgidula. In Diatoms of the United States. Retrieved August 27, 2016, from

Species: Cymbella turgidula

Contributor: Marina Potapova

Reviewer: Sarah Spaulding


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.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Cymbella turgidula CAS

North American Diatom Ecological Database (NADED)

NADED ID: 23083

Autecology Discussion