Suborder (1) Chlamydodontina Deroux, 1976

Syn. Chilodonellina

With characteristics of order s.s. (above). Ventral ciliature thigmotactic, with no prominent specialized adhesive organelle; body broad in shape and flattened dorsoventrally.

Broad thigmotactic zone; body width < 2/3 length, with pronounced anterior "beak" to left; some Chilodonella harmful on gills of fresh-water fishes.	Family CHILODONELLIDAE Deroux, 1970
Thigmotactic zone localized; body shape nearly ellipsoidal, with width > 2/3 length.	Family CHLAMYDODONTIDAE Stein, 1859
Thigmotactic zone broad, with curious structureless protrusions in several species; preoral arcs of ciliature isolated.	Family LYNCHELLIDAE Jankowski, 1968