Kociolek, P.
(2012).
Simonsenia.
In Diatoms of North America.
Retrieved May 01, 2026, from https://diatoms.org/genera/simonsenia?x-craft-preview=cab8b13ef68d1e257235fd2491770f51dfe0c9a6c0ad3b95411776e5316d603alxhbyabypv
Nitzschioid
Simonsenia
Raphe within raised canal
Raphe positioned on valve margin
Valve with regularly spaced depressions near margin
Simonsenia is a genus that possesses characters seen in both the Surirellaceae and the Nitzschiaceae. Its valve symmetry and general shape, with the raphe being present on only one valve margin, resembles that of many Nitzschia species. Also, the cribra of the areolae are similar to those in many Nitzschia species. However, its raphe is...