Family Iotonchidae Goodey 1935 (roundworm)
Enoplea - Rhabditida - Iotonchidae
Parent taxon: Sphaerularioidea according to G. O. Poinar 2011
Sister taxa: Allantonematidae, Anguinidae, Sphaerulariidae
Subtaxa: Paleoiotonchium
Distribution: found only at Dominican amber (Poinar coll) (Miocene to Miocene of Dominican Republic)