Valves are strongly arched and semicircular. Apices are subrostrate and may be recurved. Transapical striae are separated by externally thickened transapical costae, which form wing-like projections at the dorsal margin.
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.