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Guide to Pinnularia torta

(A.Mann) R.M.Patrick 1966

Pinnularia torta guide
  1. Valve linear
  2. Axial area markedly asymmetric
  3. Central area elliptic

Valves are linear, with bluntly rounded apices. The axial area is markedly asymmetric about the apical plane, positioned closer to secondary valve side at the valve ends.