Diatoms of North AmericaDiatoms of North America
Return to overview

Guide to Pinnularia transversa

(A. Schmidt) Mayer 1940

Pinnularia transversa guide
  1. Valves long and narrow
  2. Axial area linear
  3. Central area narrow, asymmetric
  4. Raphe lateral
  5. Terminal raphe fissures hooked

Valves are linear, long, and narrow. The axial area is linear and slightly widened into slightly elliptic, asymmetric central area. The striae are radiate in the center and convergent at the apices. The raphe is lateral and terminal raphe fissures are hook-shaped.