Order Plectida Malakhov 1982 (roundworm)
Parent taxon: Dorylaimia according to G. O. Poinar 2011
Sister taxa: Chromadorida, Desmoscolecida, Mermithida, Rhabditida
Subtaxa: Captivonemidae Plectidae
Distribution:
• Eocene of the Russian Federation (1 collection)
• Cretaceous of Svalbard and Jan Mayen (1)
Total: 2 collections each including a single occurrence