Diatoms of North AmericaDiatoms of North America
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Guide to Achnanthidium delmontii

Pérès, Le Cohu and Barthès 2012

Achnanthidum Delmontii Guide
  1. Terminal raphe ends curved to the same side of the valve
  2. Valve ends rounded
  3. Central area on raphe valve trapezoid
  4. Areolae on raphe valve small and indistinguishable with LM

Valves are linear-elliptic to elliptic, with rounded to blunt apices. The raphe valve has a fascia-like central area and small, indistinguishable areolae. The terminal raphe ends curve to the same side of the valve.