Decussata Placentual Guide
Credit: Pat Kociolek
  1. Axial area narrow
  2. Proximal raphe ends prominent
  3. Areolae offset

Valves elliptic with rostrate to rostrate-apiculate ends. The axial area is narrow. The raphe is filiform and straight to slightly undulate, with prominent, dilated external proximal raphe ends. Areolae are slightly offset from one another, producing decussate striae.