Argynnia dentistoma var. lageniformis Playfair, 1917
Diagnosis: Test broadly ovate as in the type, but drawn out and constricted above the pseudostome into a short neck. Pseudostome minutely crenulate by a regular series of marginal plates. Wall of the test formed of minute, irregular, angular plates (diam. About 6 µm).
Dimensions: Length 126 µm; width 90 µm; aperture 38 µm.
Ecology: Auburn, Australia