Iconella guatamalensis guide
  1. Valves large
  2. Valve surface appears structureless
  3. Valves heteropolar
  4. Head pole with depression
  5. Costae short

Valves are heteropolar and flat, except for a depression at the head pole. The fibula density is 28-31 in 100 ┬Ám. The costae are short, while areolae and striae are delicate, which makes the valves appear structureless under LM. The raphe is positioned within a marginal canal, raised onto a keel, and supported by alar canals.

The large, flat, and structureless valves of Iconella guatimalensis are distinct and unlikely to be confused with any other diatom species.