Compare Stephanodiscus parvus
Compare
Stephanodiscus minutulus lacks a distinct central fultoportula. Cyclostephanos invisitatus has a central annulus, higher areola density and striae are arranged in multiseriate fascicles. Stephanodiscus binderanus grows in chains and has a deep mantle, uniseriate fascicles, a lower areola density and absence of a central fultoportula. Stephanodiscus hantzschii and S. hantzschii f. tenuis may both be larger in diameter, lack a central fultoportula and possess multiseriate fascicles.
LM scalebar = 10 µm
Diameter
4.3-9.5 µm
4.3-9.5 µm
Striae in 10 µm
8-12 based on circumferential count
8-12 based on circumferential count
Cyclostephanos invisitatus
Diameter
7.8-15.1 µm
7.8-15.1 µm
Striae in 10 µm
15-16 based on chord count, 12-15 based on circumferential density
15-16 based on chord count, 12-15 based on circumferential density
Stephanodiscus binderanus
Diameter
6.3-11.8 µm
6.3-11.8 µm
Width Range
2.6-4.7 µm
2.6-4.7 µm
Striae in 10 µm
10 to 15 based on circumferential density
10 to 15 based on circumferential density
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
Stephanodiscus hantzschii fo. tenuis
Diameter
15.5-19 µm
15.5-19 µm
Striae in 10 µm
5.7-7.5 based on circumferential density
5.7-7.5 based on circumferential density