It has an oval to ellipsoid shape, measuring about 12 imes 8 ext{ um}, and may have 2 to 4 nuclei, longitudinal fibrils in varying numbers, and crescent-shaped structures called dark bodies.

It measures about 20 imes 10 ext{ um}, has a pear-shaped, bilaterally symmetrical body, with a smooth dorsal surface and a concave ventral surface, in addition to two comma-shaped structures, two nuclei, and 4 pairs of flagella.