Steidinger & Tangen (1997: 453)
Cells unarmoured, fusiform, 55–60 µm long, 18–20 µm diameter. Theca with c. 8 longitudinal ridges; epitheca tapering towards a pointed apex, approximately three-quarters of the cell length. Cingulum descending. Chloroplasts absent.
Southern Ocean, south of Australia.
A small number of specimens were seen in the present study, but unambiguous identification was not possible.