Family Plectidae Orley 1880 (roundworm)
Enoplea - Plectida - Plectidae
Parent taxon: Plectida according to G. O. Poinar 2011
Sister taxon: Captivonemidae
Subtaxa: Oligoplectus
Distribution: found only at Baltic Amber (Duisburg collection) (Eocene of Russian Federation)