Cyclotella atomus

Hust. 1937      Category: Centric

Cyclostephanos invisitatus


Cyclotella distinguenda

LM scalebar = 10 µm = 80 pixels.


Contributor: Rex Lowe - January 2015
Diameter: 5-7.5 µm
Rows of areolae in 10 µm: 16-18


Cyclotella atomus has a flat valve face with short striae arranged around the margin on the valve. A fultoportula can be seen toward the center of the valve (but slightly off center) appearing as a dark dot. Marginal fultoportulae occur on every fourth to fifth costa and can be seen in deep focus as dark spots.

Original Description

Author: Hust. 1937
Diameter: 4-5 µm
Rows of areolae in 10 µm: 16-18

Original Description

Original Images

Cite This Page:
Lowe, R. (2015). Cyclotella atomus. In Diatoms of the United States. Retrieved April 23, 2018, from

Species: Cyclotella atomus

Contributor: Rex Lowe

Reviewer: Mark Edlund


Houk, V., Klee, R. and Tanaka, H. (2010). Atlas of freshwater centric diatoms with a brief key and descriptions, Part III. Stephanodiscaceae A. Cyclotella, Tertiarius, Discostella. Fottea 10 (Supplement): 1-498.

Hustedt, F. (1937). Systematische und ökologische Untersuchungen über die Diatomeen-Flora von Java, Bali und Sumatra nach dem Material der Deutschen Limnologischen Sunda-Expedition. Archiv für Hydrobiologie, Supplement 15: 187-295.

Kiss, K.T., Klee, R., Ector, L. and Ács, É. (2012). Centric diatoms of large rivers and tributaries in Hungary: morphology and biogeographic distribution. Acta Botanica Croatica 71: 311-363.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Cyclotella atomus CAS

NCBI Genbank Taxonomy

Cyclotella atomus NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 20001

Autecology Discussion

Common in warm nutrient-rich rivers.