Stauroneis Supergracilis Guide
Credit: Loren Bahls
  1. Valves narrowly lanceolate
  2. Apices subtly protracted
  3. Proximal raphe ends curved and inflated
  4. Areolae 14-18 in 10 µm

Stauroneis supergracilis has large, narrowly lanceolate valves, 124-213 µm long, with subtly protracted apices. Proximal raphe ends are curved and inflated. Areolae are relatively coarse and number 14-18 in 10 µm.