Petz, Song & Wilbert (1995: 47, figs 15, 61)
In vivo c. 200–260 × 55–70 µm. Body knife-blade-shaped; neck not distinct from trunk; oral slit with an inconspicuous rope-like structure c. one-third of body length; laterally flattened (right side often slightly grooved by kineties). Somatic kineties 19–25 right, 9–15 left (anteriorly slightly shortened). Brosse of c. 80 dikinetids in anterior half of body, in anterior portion usually fragmented. Perioral kineties 3. Extrusomes curved-graver-shaped, 13–16 µm long, along entire ventral margin (some always on antapical pole) and in body. Cortical granules colourless, in interkinetal rows. Macronuclear nodules 2; micronucleus 1. Contractile vacuole subterminal near ventral margin. Movement: slowly gliding.
Weddell Sea (Petz et al., 1995).