Diatoms of North AmericaDiatoms of North America
Return to overview

Guide to Navicula gregaria

Donkin 1861

Navicula Gregaria Guide
Credit: Marina Potapova
  1. Valves lanceolate with protracted apices
  2. Central area asymmetric
  3. External proximal raphe ends bent toward primary side
  4. Striae slightly radiate around the center
  5. Areolae clearly visible under LM

Valves are lanceolate with protracted apices, 4.1-7.0 µm wide. The central area is asymmetric and elliptic. The external proximal raphe ends are sharply bent toward primary side of the valve. Striae are slightly radiate around the center, numbering 14-18 in 10 µm and are convergent at the apices. The areolae are clearly visible under LM, numbering 25-32 in 10 μm.

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.

Donate today