Staurosirella Martyi Guide
Credit: Edna Pedraza Garzon, Sarah Spaulding, Ian Bishop
  1. Valves may be heteropolar or isopolar
  2. Valves coarse
  3. Areolae lineolate
  4. Apical pore field present at footpole

Valves are coarse and variable in outline; they may be heteropolar to isopolar. The striae are composed of lineolae and appear coarse, refractive and distinctive. A single apical porefield is present at the footpole. A “step” at the headpole may be present or absent. Spines are absent.