H.A.Thomsen (1979: 21, figs 3, 22–25, 30, 31)
Cells solitary. Lorica c. 8 µm long, c. 7 µm diameter at the level of the anterior transverse costa; posterior lorica chamber 5.5 µm long; longitudinal costae c. 15; transverse costae 2. Arrangement of costal strips in posterior part of lorica complex and variable. Longitudinal costae comprising 4 costal strips; anterior costal strips with rounded ends, overlapping substantially with penultimate anterior costal strip as well as anterior transverse costae; longitudinal costal strips somewhat thicker than transverse strips. Pedicel markedly offset from long axis of lorica (hence the specific epithet). Protoplast ellipsoidal, to 4 µm long, 3 µm diameter.
Occurs only rarely in the inshore waters of Prydz Bay, East Antarctica; Finland (Thomsen, 1979).
The Antarctic organisms differ from the type description from Finland in that the cells are only about half as long, and the anterior transverse costa is attached to the second longitudinal costal strip (counted from the anterior end). Thomsen (1979) discussed the features distinguishing Acanthoecopsis asymmetrica from Acanthoecopsis spiculifera R.E.Norris and Acanthocorbis apoda.