Staurosirella Rhomboides Guide
Credit: Eduardo Morales
  1. Valves rhomboid
  2. Striae as wide
  3. Spines flat, positioned on costae

Valves are rhomboid with rounded ends. Striae are wide, formed by lineolate areolae. Spines are flat, solid and positioned on the costae. Two distinct porefields are present at each apex. The headpole porefield is larger than the footpole porefield.