Sellaphora Atomoides Guide
Credit: Alison Minerovic
  1. Valves linear to linear-elliptic
  2. Central area rectangular or bow tie-shaped
  3. Striae radiate
  4. Striae uniseriate
  5. Striae curved near central area

Valves are linear to linear-elliptic. The central area is distinctly rectangular or bow tie-shaped. Striae are radiate, uniseriate and noticeably curved near the central area.