Aphaenogaster longaeva is an extinct species of ant in formicid subfamily Myrmicinae known from a solitary Eocene or Oligocene fossil found in North America.

[2] More recently the site was suggested to be of Oligocene age by Archibald and Mathewes (2000) based on the fossils of nearby Quilchena, British Columbia.

[3] Archibald et al (2018) considered the fossil site itself to be lost, but most likely to belong to the Eocene Okanagan Highlands, a series of Ypresian age lakebeds arcing from Driftwood Canyon north of Quesnel, to the Klondike Mountain Formation sites around Republic, Washington to the south.

The fossil was first studied by paleoentomologist Scudder with his 1877 type description of the new species being published in an addendum to Dawson's Report of Progress, Geological Survey of Canada, 1875–76.

[4] The Aphaenogaster longaeva fossil is a jumble of parts that obscure the total length of the adult, though the preserved wings and body segments possibly indicate it to be a male.