Family Tetradonematidae Cobb 1919 (roundworm)
Enoplea - Mermithida - Tetradonematidae
Parent taxon: Mermithoidea according to G. O. Poinar 2011
Sister taxon: Mermithidae
Subtaxa: Myrmeconema Palaeotetradonema
Distribution:
• Miocene of the Dominican Republic (1 collection), Mexico (1)
• Eocene of the Russian Federation (1)
Total: 3 collections each including a single occurrence