Genus: Stephanopyxis | Diatom

Order: Biddulphiales
Family: Melosiraceae

Description: Cylindrical, sometimes nearly spherical, capsule-shaped cells. Valves are domed with large hexagonal areolae. Cells have numerous discoid or lobed chloroplasts. Some species form resting spores.

Cell Size: Diameter (apical axis) = 24-71um

Distribution: Some species are found in temperate to northern cold water, other species are found in temperate to warm waters.