Platessa Bahlsii Guide
Credit: Loren Bahls
  1. Valves elliptic
  2. Central area on raphe valve very small
  3. Striae multiseriate
  4. Terminal raphe fissures absent

Valves are elliptic. Raphe valve has a narrow linear axial area and a small central area. Raphe is filiform, straight, with slightly expanded distal and proximal ends. Rapheless valve has a linear–lanceolate axial area. Striae are multiseriate, radiate.