J.Schiller (1925b: pl. 4, fig. 24)
Leadbeater (1973: 237, figs 1a, b, 2b, pl. 14a–d, pl. 15a, b), Hallegraeff (1983: 501, fig. 37); Buck & Garrison (1983: 1273, fig. 24)
Cells solitary. Lorica barrel-shaped, 25–28 µm long, 16–21 µm diameter; longitudinal costae 9–13; transverse costae 3. Longitudinal costae comprising 4 costal strips; in some specimens the anterior costal strips extend c. 25% of their length beyond the anterior transverse costa. Protoplast subspherical, 3 µm diameter, lying in close connection with the base of the lorica.
Inshore and oceanic sites in Prydz Bay, East Antarctica; coast near Sydney, Australia, coastal waters, New Zealand and Thailand (Hallaegraaf, 1983); Adriatic and Bay of Algiers (Leadbeater, 1974); Disko Bay, West Greenland (Thomsen, 1982).
Details of the lorica and inner loricate collar were discussed by Leadbeater (1973). Takahashi (1981) illustrated this organism (as “species 4”) with longitudinal costal strips extending beyond the anterior transverse costa, as did Hallegraeff (1983) in material from the East Australian Current. Specimens with the longitudinal costae terminating at the anterior transverse costa were reported by Buck & Garrison (1983).