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Guide to Frustulia soror

Graeff and Kociolek 2011

Frustulia Soror Guide
Credit: Carrie Graeff
  1. Longitudinal ribs complete on one side
  2. Valve apices slightly rostrate
  3. External proximal raphe ends unilaterally deflected

The longitudinal ribs in Frustulia soror are complete only on one side of the valve, the side of the valve to which the proximal raphe ends are deflected. Valves are linear-lanceolate with slightly rostrate apices. The external proximal raphe ends are unilaterally deflected.