Chamaepinnularia witkowskii guideb
  1. Valves linear-elliptic
  2. Central area large, transversely elliptic or rectangular
  3. Striae interrupted by hyaline areas
  4. Raphe straight

Valves are linear-elliptic with slightly set-off broadly rounded apices. Narrow axial area expands into large, transversely eliiptic or rectangular central area. Striae are interrupted by four hyaline areas, one on each half and each side of the valve.