Song (2000: 299, figs 2, 12)
In vivo 15–25 × 10–15 µm. Body barrel-shaped; ventral margin straight; frontal plate conspicuous and set off; oral area c. 75% of body length. Somatic kineties 11–13, leftmost posteriorly shortened; caudal cilium as long as body. Adoral membranelles 3, long; paroral membrane prominent. Scutica composed of 2–4 dikinetids, in 2 distinctly separate groups. Macronuclear nodules 2; possibly with 1 micronucleus. Contractile vacuole subterminal on ventral side. Movement: fast, jumping, motionless in-between.
Atlantic sector of the Southern Ocean (Song & Wilbert, 2002); Pacific (Song, 2000).