Petz, Song & Wilbert (1995: 18, figs 5, 62)
In vivo 85–160 × 40–80 µm. Body ellipsoidal to obovoid, distinctly indented in anterior third in area of subapical cavity; cytostome apical; laterally flattened, often deformed due to large prey. Somatic kineties 36–40, meridional to slightly spiralling. 2 C-shaped ciliary rows in subapical cavity Adoral organelle (brosse) extending from subapical cavity to apex (along right side of mouth). Circumoral kinety probably non-ciliferous. Extrusomes rod-shaped, c. 14 µm long, along adoral organelle and in subapical cavity. Macronucleus usually ellipsoidal, sometimes slightly sausage-shaped; micronucleus 1. Contractile vacuole terminal. Silverline system hexagonal, interrupted by longitudinal lines. Movement: not fast, rotating about main body axis when swimming.
Weddell Sea (Petz et al., 1995).