Rexlowea Navicularis Guide
Credit: Pat Kociolek
  1. Apices protracted to broadly rounded
  2. Proximal raphe ends large, rounded
  3. Central area with isolated puncta
  4. Raphe lateral
  5. Raphe undulate

Valves are broadly lanceolate with apices protracted to broadly rounded. The raphe is lateral and undulate. Within a stria, the marginal areolae are large and more coarsely arranged. The middle valve has areolae comparatively smaller and rounded. Central area has large, round isolated puncta. The smallest striae at the apices are multiseriate throughout their length.