Cymbella Cosleyi Guide
Credit: Loren Bahls
  1. Valves distinctly dorsiventral
  2. Apices rounded or subrostrate
  3. Two stigmata present
  4. Ventral margin nearly flat

Cymbella cosleyi has distinctly dorsiventral valves with subrostrate, or rounded apices. The ventral margin is nearly flat, to weakly concave and slightly gibbous in the center. Two ventral stigmata are present. Areolae number 28-30 in 10 ┬Ám and are distinguishable under LM.