Compare Cyclostephanos invisitatus
Compare
Cyclostephanos invisitatus is distinct by its flat valve face compared to C. dubius and C. tholiformis, which are concentrically undulate. Although similar in size and ornamentation, C. invisitatus differs from Stephanodiscus hantzschii by having a greater density of fascicles. Although similar in fascicle density, S. parvus differs from C. invisitatus by having coarse, punctate striae and a distinct fultoportula.
LM scalebar = 10 µm
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
Cyclostephanos tholiformis
Diameter
9.1-15.3 µm
9.1-15.3 µm
Striae in 10 µm
10-14 fascicles based on circumferential density
10-14 fascicles 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
