Cymbella turgidula
Grunow in Schmidt et al. 1875 Category: Asymmetrical biraphid
BASIONYM: Cymbella turgidula Grunow in Schmidt et al. 1875
LM scalebar = 10 µm = 40 pixels.
Observations
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
Description
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 May 23, 2013, from http://westerndiatoms.colorado.edu/taxa/species/cymbella_turgidula
Species: Cymbella turgidula
Contributor: Marina Potapova
Reviewer: Sarah Spaulding
Image Credit: Marina Potapova
- Valves 9.5-14.0 μm wide
- Valves slightly dorsiventral
- Stigmata 2 (sometimes 3)
- Central striae 9-11 in 10 μm
- Areolae 22-24 in 10 μm
The dorsal valve margin is strongly arched and the ventral margin is moderately convex. Stigmata usually 2, but may be 3; stigmata located at the end of the middle striae. The areolae number 22-24 in 10 μm.
Compare
Cymbella turgidula differs from C. subturgidula by more convex ventral valve margin and a higher areola density. Compared to C. tropica, C. turgidula has two, and sometimes three, stigmata while C. tropica usually has only one stigma.
Cymbella subturgidula
Cymbella tropica
Citations
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)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 23083