Sellaphora hohnii and S. rexii have wider apices than S. californica. The valves of S. mutatoides and S. rexii are narrower and the corresponding grooves and conopea are also more narrow.
LM scalebar = 10 µm
Length Range
23-40 µm
Width Range
8-10 µm
Striae in 10 µm
20-22 in the center valve, 26-28 at the ends