Eunotia Papilioforma Guide
Credit: Paula Furey
  1. Valve asymmetric to apical axis
  2. Position of the helictoglossae asymmetric to transapical axis
  3. Apices 'nose-like'
  4. Distal raphe curves onto valve face
  5. One apical rimoportula

Valves asymmetric to the apical axis, that is, one apex is wider than the other. The helictoglossae are removed from the apices, in a position that is asymmetric to the transapical axis. The apices are rounded, tapered and combined with the inset helictoglossae, the apices .appear 'nose-like'. Distal raphe curves onto the valve surface. One apical rimoportula is present at the wider valve end.