Suborder (3) Prorodontina Corliss, 1974

Cytostome apical or subapical, round or oval, sometimes in shallow atrium; unique brosse on dorsal surface near anterior pole; somatic toxicysts common; skeletal plates in one genus; most species carnivores or scavengers, a few algivorous.

Without skeletal plates; most species carnivores or scavengers, a few algivorous.	Family PRORODONTIDAE Kent, 1881
Body characteristically barrel-shaped, bearing uniquely calcified cuirass (armored plates in longitudinal rows, with small lateral teeth); prominent anterior and caudal thorns often present; long caudal cilium common; active scavengers.	Family COLEPIDAE Ehrenberg, 1838