Anomoeoneis Costata Guide
  1. Valves rhombic-lanceolate
  2. Apices narrowly rounded
  3. Axial area wide
  4. Central area asymmetric

Valves are large, more than 20 µm in width, and rhombic-lanceolate. Apices are narrowly rounded and not protracted. The axial area is wide and bordered by curved longitudinal rows of areolae. The central area is asymmetric and reaches the valve margin on one side.