Grunow (1878), in Schmidt et al. (1874–1959, pl. 57, figs 33–35)
Mann (1937: 40), Priddle & Fryxell (1985: 150, figs A, B)
Cells (presumably) discoid. Valves circular, 40–100 µm diameter. Areolation fasciculate; areolae 6–10 in 10 µm, irregular in central area, otherwise in curved rows. Marginal band of small areolae narrow, striate; striae 12–16 in 10 µm (Hustedt, 1927–30). Single ring of marginal labiate processes; one process at the end of leading row of fascicle.
Antarctic, near Commonwealth Bay, East Antarctica (Mann, 1937); South Atlantic and Scotia Seas (Hendey, 1937); Southern Ocean (Priddle & Fryxell, 1985).
This species has rarely been reported from the Antarctic. Priddle & Fryxell (1985) noted that its generic position is uncertain, and that it may belong to Actinocyclus (Hemidiscaceae).