Lacustriella Lacustris Guide
Credit: David Burge
  1. Valves lanceolate
  2. Central area elliptic
  3. Apices protracted
  4. Striae punctate with dash-like terminal areola

Valves are lanceolate with protracted apices. The axial area is lanceolate, narrowing to the central area. The central area is transapically elliptic. Striae are punctate, with a with dash-like terminal areola.