Stauroneis phoenicenteron has smaller valves than S. rex (26-35 µm wide by 129-199 µm long) and a higher stria density (15-18 in 10 µm). It is likely that S. rex has been misidentified as S. phoenicenteron in U.S. surveys. Stauroneis terryi has septa and pseudosepta. Stauroneis baileyi, reported from Connecticut, has rhombic-lanceolate valves with narrower, more attenuated ends.
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.