The following description is based on the neotype material, which agrees very well with the population described by Kahl (1932): Body size 130 to 180 long by 30 to 60 microns wide in vivo. Body elongate-rectangular, slightly brownish at low magnification. Cortex only slightly flexible, packed with 0.3 to 0.5 microns-sized, colourless cortical granules. Several ring-shaped cytoplasmic inclusions. On average 43 adoral membranelles and 23 right and 27 left marginal cirri. Each dorsal kinety with one caudal cirrus. Two macronuclear nodules and 1 to 4 micronuclei. Contractile vacuole lacking. (from Li et al., 2010. Acta Protozoologica, 49: 195-212)