[2][3] When described Formicodiplogaster myrmenema was described from approximately seven fossil nematodes which were group inclusions with ants in transparent chunks of Dominican amber.

[2] The amber was produced by the extinct Hymenaea protera, which formerly grew on Hispaniola, across northern South America and up to southern Mexico.

The specimens were collected from a number of amber mines in fossil bearing rocks of the Cordillera Septentrional mountains, northern Dominican Republic.

The fossils were first studied by paleontologist George Poinar Jr. of Oregon State University, with his 2011 type description of the new genus and species being published in the journal Nematology monographs and perspectives pages.

Similarly the dauer stage juveniles are the same general shape, with rounded heads and tapered tails, ranging from 120–208 micrometres (0.0047–0.0082 inches) long.