Incertae sedis in suborder Clevelandellina:

Family NATHELLIDAE Singh, 1953

Syn.	Nathelliidae

Body relatively large, uniformly ciliated; the adoral ciliature and "peristome" course from anterior to posterior end of body in a gentle sigmoidal curve; compact macronucleus; single contractile vacuole; organisms found in digestive tract of fresh-water siluroid fishes.

[More and better data needed! Possibly these ciliates are congeneric with Inferostoma; in which case the names of the preceding family and genus would have to fall as junior synonyms of Nathellidae and Nathella, respectively.]

Nathella Singh, 1953. Few species.