| Climacostomum Stein, 1859. Few to several species. |
  |
| Fabrea Henneguy, 1890 (syn. Bursalinus). Single species. |
  |
| Pediostomum Kahl, 1932. Single species. |
| Contents | Classes | Subclasses | Orders | Suborders | Families |
Family CLIMACOSTOMIDAE Repak, 1972
| Syn. | Pediostom [at] idae |
Body large, ovoid, with very prominent peristomial field (buccal caviry) occupying much of anterior part of body; stomatogenesis parakinetal; paramembranelles conspecuous; somatic ciliation dense; macronucleus usually in form of thick ribbon, often coiled and lengthy; symbiotic zoochlorellae in some species; fresh-water and marine forms.
| Climacostomum Stein, 1859. Few to several species. |
|
| Fabrea Henneguy, 1890 (syn. Bursalinus). Single species. |
|
| Pediostomum Kahl, 1932. Single species. |