H.A.Thomsen (1978b: 364, figs 5, 15, 16)
Thomsen (1979: 130, figs 52, 53), Croome et al. (1987: 24, figs 3, 6)
Cell body spherical, 10–13.5 µm diameter, covered with overlapping scales. Scales oval to ±circular, 3–3.3 µm diameter, with 3–8 perforations; distal surface 0.4–0.5 µm diameter. Spine scales tubular, 0.9–1.5 µm long, 0.5–0.55 µm diameter at apex, 0.24–0.35 µm wide in mid-region, with base-plate 0.55–0.65 µm diameter, attached to distal surface of plate scales, usually peripheral to the large perforations but apparently arranged at random, with up to 5 spine scales attached to each plate scale.
Coastal waters near the Vestfold Hills, East Antarctica (Croome, 1987); type locality, Dybsø Fjord, Denmark (Thomsen, 1978b); Peru (Gaarder et al., 1976); Japan (Takahashi, 1981b).