Heiden & Kolbe (1928: 613, pl. 2, fig. 56)
Cells solitary, panduriform, with rounded poles in valve view; apical axis 58–91 µm; transapical axis 21–30 µm. Striae 4.3–6 in 10 µm, with radiating slits along each margin and with a uniseriate row of pores along either side of raphe; pore size variable. Raphe central; terminal fissures hooked externally (Fig. c). Internal longitudinal canals present on either side of the raphe (Fig. d). Girdle consisting of a few open copulae (Fig. b).
Sea-ice and coastal waters near Davis Station, East Antarctica; Observatory Bay, Kerguelen Is. (Heiden & Kolbe, 1928).
Specimens from Antarctic coastal waters near Davis Station measured 70–90 µm long and 25–30 µm wide (20–25 µm at constriction), with striae 5–6 in 10 µm.