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Guide to Pleurosigma inflatum

Shadbolt 1854

Pleurosigma Inflatum Guide
Credit: Katie Johnson
  1. Valves sigmoid, broadly lanceolate to slightly rhombic
  2. Valves face convex or arched
  3. Apices accutely rounded
  4. Raphe sigmoid and eccentric
  5. Central area circular

The valve face is arched, so that only a portion of the valve face will be in focus. Apices are acutely rounded. The raphe is sigmoid and eccentric. The central area is circular.