Mastogloia Smithii Guide
Credit: Pat Kociolek
  1. Valves elliptic-lanceolate
  2. Protracted apices
  3. Valvocopulae with locules
  4. Striae 15-18 in 10 µm

Valves elliptic-lanceolate with protracted, broadly rounded apices. The raphe is filiform, becoming lateral at about ½ from the apices to the center. Striae are radiate and distinctly punctate.