Song & Wilbert (2002: 24, figs 3, 21–23)
In vivo 70–150 × 30–65 µm. Body narrowly to broadly lanceolate, with c. 4 longitudinal grooves on left side, laterally flattened, contractile. Somatic kineties 6–8 on right (most anteriorly shortened) and 3 or 4 on left. Brosse of c. 18–20 dikinetids with bristle-like cilia. Perioral kineties 3 (2 to right, 1 to left of mouth). Extrusomes rod-shaped, 4–6 µm long, mainly along oral area. Macronuclear nodules (1 or ) 2; micronucleus 1. Contractile vacuole terminal. Movement: slowly gliding.
Atlantic sector of the Southern Ocean (Song & Wilbert, 2002).