Staurosirella Pinnata Guide
Credit: Eduardo Morales
  1. Valves oval
  2. Areolae lineolate
  3. Costae with spines

Striae are composed of pronounced lineolate areolae; costae are narrow. Solid spines are positioned on the costae. In the SEM, spines are conical at the base, becoming spatulate near the terminus. Porefields are absent. Girdle bands are open and lack perforations.