| Contents | Classes | Subclasses | Orders | Families |
Family ANOPLOPHRYIDAE Cépède, 1910
| Syns. | Herpetophryidae, Metastom[at]idae, Orchitophryidae |
No endoskeleton, apical hooks, or suckers, but area of thigmotactic cilia often present; reproduction without chain formation; body relatively small, ovoid to elongate-ovoid; primarily in terrestrial oligochaetes, though some species presumably from other hosts (e.g., the dubious Orchitophrya was found in sea-star gonads and an Anoplophrya reported from lobster gut).
| Almophrya de Puytorac & Dragesco, 1969. Few species. |
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| Anoplophrya Stein, 1860 (syns. Eliptophrya, Macrophrya). Many to very many species. |
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| Corlissiella de Puytorac, 1960. Single species. |
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| Herpetophrya Siedlecki, 1902. Single species. |
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| Lomiella de Puytorac, 1961. Few species. |
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| Lubetiella de Puytorac, 1959. Few species. |
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| Metastomum Georgévitch, 1941. Single species. |
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| Paranoplophrya Rohrbach, 1936. Single species. |
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| Perseia Rossolimo, 1926 (syn. Persea). Few species. |
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| Prototravassosia Artigas & Unti, 1938. Single species. |
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| Sigmophrya de Puytorac, 1971. Single species. |
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| Incertae sedis: | |
| Orchitophrya Cépède, 1907. Single species. |