Manton & Oates (1979a: 299, figs 1–30)
Buck & Garrison (1983: 1264, fig. 28), Thomsen et al. (1990: 370, figs 9, 10, 18, 19)
Cells solitary. Lorica c. 34 µm long overall; lorica chamber 11 µm diameter. Longitudinal costae 4; transverse costae 2. Anterior spines 4, to 14 µm long, continuous with longitudinal costae; pedicel sometimes present, to 8 µm long. Protoplast spherical, to 4.5 µm diameter.
Common at inshore and oceanic stations of Prydz Bay, East Antarctica; Weddell Sea (Buck, 1981); Alaska, Arctic Canada, Britain, the Galapagos Is. and South Africa (see Manton & Oates, 1979b).
Cells were found in equal frequency with or without a pedicel, and the 2 transverse costal strips were obvious in both LM and EM preparations. Manton & Oates (1979a) reported considerable variability in overall dimensions.