Staurosira Construens Guide
Credit: Eduardo Morales
  1. Valves cruciform
  2. Striae alternate
  3. Striae in valve center curved
  4. Apical pore fields present
  5. Spines hollow

Valves of S. construens are cruciform in outline. Striae from each side of the valve do not meet in the center, they are alternate. Striae near the middle part of the valve may be curved. Apical pore fields are present and are composed of poroids surrounded by a whitish rim. Spines are present, located between the striae. Spines are hollow and spatulate.