Family PSILOTRICHIDAE Bütschli, 1889

Cirri long and sparse and in a few curving ventral rows; no differentiated frontals and no transverse cirri; peristomial area limited to anterior third of organism; body oval to elliptical in outline, small, often with zoochlorellae in cytoplasm; two macronuclei; exclusi~aely fresh-water forms.

[Does it deserve independent familial status?]

Hemiholosticha von Gelei, 1954. Single species.
Psilotricha Stein, 1859 (syn. Pigostyla). Few species.