Petz, Song & Wilbert (1995: 93, fig. 27)
In vivo 40–55 × 17–30 µm. Body drop-shaped to pyriform, anteriorly pointed; oral area in anterior half of body, indistinctly indented; frontal plate very small; laterally slightly flattened. Somatic kineties 13–15 (c. 20–27 kinetosomes per row); caudal cilium rather stiff, half as long as body. Adoral membranelles 3, small; membranelle 1 composed of 1 ciliary row; membranelle 2 of 1 long and 1 very short row; paroral membrane inconspicuous. Scutica Y-shaped, consisting of 4–6 single kinetosomes and 1 dikinetid. Extrusomes indistinct in vivo. Macronucleus 1; micronucleus 1. Contractile vacuole terminal. Movement: not fast, swimming in a spiral path.
Weddell Sea (Petz et al., 1995).