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Temporal range: 48–29 Ma Lutetian, Middle Eocene to Early Oligocene
Eoformica pinguis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae (incertae sedis)
Subfamily: Uncertain
Genus: Eoformica
Carpenter, 1921
Type species
Eoformica eocenica (junior synonym of Eoformica pinguis)
6 fossil species
(Species Checklist)

The taxonomomic placement of this genus is uncertain and it is currently considered incertae sedis in Formicidae. There are four species found in Florissant shale (Oligocene) from Colorado, USA.


Male. - Length, 7.5mm; head small, nearly round, but somewhat broader behind; thorax broad, about twice as wide, and more than twice as long as the head and somewhat broader. Length of head, 1.2mm; thorax, 2.2mm; gaster, 2.7mm.


This taxon is known from Green River Formation, Colorado, United States (Lutetian, Middle Eocene); Kishenehn Formation shale, Montana, United States (Lutetian, Middle Eocene) and Kleinkems, Germany (Early Oligocene).




The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • EOFORMICA [incertae sedis in Formicidae]
    • Eoformica Cockerell, 1921: 38. Type-species: †Eoformica eocenica (junior synonym of †Eoformica pingue), by monotypy.
    • Eoformica transferred from Ponerinae to Myrmicinae: Carpenter, 1930: 17.
    • Eoformica incertae sedis in Formicidae: Dlussky & Rasnitsyn, 2002: 424.
  • FORMICITES [collective group name]
    • Formicites Dlussky, 1981: 75. [Collective group name.]
    • Formicites material absorbed into †Eoformica: Dlussky & Rasnitsyn, 2002: 424.


  • Barden, P. 2017. Fossil ants (Hymenoptera: Formicidae): ancient diversity and the rise of modern lineages. Myrmecological News 24: 1-30.
  • Bolton, B. 1994. Identification guide to the ant genera of the world. Cambridge, Mass.: Harvard University Press, 222 pp. (page 106, Eoformica incertae sedis in Myrmicinae)
  • Bolton, B. 1995b. A new general catalogue of the ants of the world. Cambridge, Mass.: Harvard University Press, 504 pp. (page 188, Eoformica incertae sedis in Myrmicinae)
  • Bolton, B. 2003. Synopsis and Classification of Formicidae. Mem. Am. Entomol. Inst. 71: 370pp (page 258, Eoformica incertae sedis in Myrmicinae)
  • Carpenter, F. M. 1930. The fossil ants of North America. Bulletin of the Museum of Comparative Zoology 70: 1-66 (page 17, Eoformica incertae sedis in Myrmicinae; Eoformica transferred from Ponerinae to Myrmicinae)
  • Cockerell, T. D. A. 1921. Some Eocene insects from Colorado and Wyoming. Proc. U. S. Natl. Mus. 59: 29-39 (page 38, Eoformica incertae sedis in Ponerinae)
  • Dlussky, G. M.; Rasnitsyn, A. P. 2003 [2002]. Ants (Hymenoptera: Formicidae) of Formation Green River and some other Middle Eocene deposits of North America. Russ. Entomol. J. 11(4): 411-436 (page 424, Eoformica incertae sedis in Formicidae [Material of Formicites (collective group name) absorbed into Eoformica])
  • Donisthorpe, H. 1943g. A list of the type-species of the genera and subgenera of the Formicidae. [part]. Ann. Mag. Nat. Hist. 11(10): 617-688 (page 643, Eoformica in Formicinae, Oecophylini)