Diatoms of North AmericaDiatoms of North America
Return to overview

Guide to Pinnularia spinifera

Potapova, Kersey and Aycock 2023

Pinnularia spinifera guide
  1. Valves linear, with straight, slightly concave, or triundulate margins
  2. Apices broadly rounded, slightly off-set
  3. Axial area 1/3–1/5 valve width
  4. Longitudinal line crosses striae mid-way
  5. Valve/mantle junction with short spines

Valves are linear, with straight or very slightly concave or triundulate margins. The apices are broadly rounded, slightly off-set. A longitudinal line crosses the striae approximately mid-way between the axial area and margin. Short spines are located on the valve face–mantle junction, on both sides of the valve, randomly placed on some virgae, with 2–5 virgae in between.

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