Compare Stephanodiscus oregonicus
Compare
Stephanodiscus alpinus has biseriate fascicles at the valve margin.
Stephanodiscus hantzschii has finer areolae and the valve face is flat, rather than concentrically undulate.
Stephanodiscus medius has a maximum of three marginal rows of areolae in each fascicle. That taxon is restricted to eutrophic waters.
Cyclostephanos novaezeelandiae has bifurcate interfascicles near the valve margin. Furthermore, fascicles are composed of 2 or 3 (at most 4) rows of areolae at the valve face/mantle junction.
LM scalebar = 10 µm
Diameter
13.0-25.6 µm
13.0-25.6 µm
Striae in 10 µm
Fascicles 3-4
Fascicles 3-4
Stephanodiscus hantzschii
Diameter
11.8-20.3 µm
11.8-20.3 µm
Striae in 10 µm
6-9 fascicles based on circumferential count
6-9 fascicles based on circumferential count
