Cocconeis Pediculus Guide
Credit: Catharina Grubaugh, Steve Main
  1. Saddle-shaped frustule
  2. Hyaline area on raphe valve margin
  3. Rapheless valve with transapically elongated areolae

The arched valves form saddle-shaped frustules. Striae on the raphe valve terminate before reaching the valve margin, creating an hyaline ring around the valve margin. Striae on the rapheless valve are transapically elongated.