Chaetocerous Elmorei Guide
  1. Frustules lightly silicified
  2. Cells adjoined by twisted setae
  3. Rimoportula present
  4. Endogenous resting spores produced

Lightly silicified vegetative cells form filamentous colonies, joined by twisted setae. Valves have a seta at each pole and a single central rimoportula. Heavily silicified endogenous resting spores may be formed.