Greville 1855      Category: Symmetrical biraphid
TYPE SPECIES: Diatomella balfouriana Greville




Image Credit: Pat Kociolek

CLASS: Bacillariophyceae
  ORDER: Naviculales
    FAMILY: Pinnulariaceae

  1. Valves with distinct septa
  2. Striae short
  3. Proximal raphe ends expanded

The frustules of Diatomella are symmetrical to the apical and transapical axes. The valve outline is linear-elliptical. An internal septum is present, with three openings forming a distinctive internal thickening of silica. The striae are short, often not extending far beyond the valve margin. The proximal raphe ends are expanded.

Diatomella is the only naviculoid diatom that possesses a septum (rather than a pseudoseptum). A single species, D. balfouriana, grows in high elevation alpine regions of Colorado, Utah, and Wyoming. The taxon prefers aerophilic habitats low in nutrients.

Cite This Page:
Spaulding, S., and Edlund, M. (2008). Diatomella. In Diatoms of the United States. Retrieved April 22, 2018, from http://westerndiatoms.colorado.edu/taxa/genus/Diatomella

Contributor: Sarah Spaulding | Mark Edlund - December 2008
Reviewer: Sam Rushforth - May 2010