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.

Diatoms of North America is running a fundraising campaign to keep the servers in operation. We need you to reach our $25,000 fundraising goal.

If you use and appreciate DONA, make your DONAtion today.

For the Gift Designation, type "diatom" in the search box and select "Diatom Lab Research Fund". This is the designated fund for diatoms.org.