AntWiki: The Ants --- Online
Temporal range: Late Eocene
Florissant, Colorado, United States
Eulithomyrmex rugosus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Agroecomyrmecinae
Tribe: Agroecomyrmicini
Genus: Eulithomyrmex
Carpenter, 1935
Type species
Lithomyrmex rugosus, now Eulithomyrmex rugosus
2 fossil species
(Species Checklist)
Eulithomyrmex rugosus Paratype no 17.019a (queen)

There are two fossil species in the genus Eulithomyrmex, both species are known from Florissant shale (Oligocene) in the United Sates. At this time Eulithomyrmex is placed within the subfamily Agroecomyrmecinae.


Female. - Head subquadrate; mandibles small; clypeus large; antennal scrobes present; antennae short, 12-segmented, with a two-jointed club; eipinotumm not armed; petiole and postpetiole short and compressed, the forewing with two cubital cells; head, thorax, and pedicel, coarsely sculptured.

Male. - Antennae 13-segmented; scape short, but a little longer than the second segment; sculpturing weaker than that of the female; forewing with two cubital cells.

Worker. - Very similar to the female, apparently differing only in the smaller size.


This taxon is known from Florissant, Colorado, United States (Late Eocene).


Queens, males and workers known.


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

  • EULITHOMYRMEX [Agroecomyrmecinae]
    • Eulithomyrmex Carpenter, 1935: 91. Replacement name for †Lithomyrmex Carpenter, 1930: 34. [Junior homonym of Lithomyrmex Clark, 1928a: 30.]
  • LITHOMYRMEX [junior homonym, see †Eulithomyrmex]
    • Lithomyrmex Carpenter, 1930: 34. Type-species: †Lithomyrmex rugosus, by original designation. [Junior homonym of Lithomyrmex Clark, above.]
    • Eulithomyrmex Carpenter, 1935: 91, replacement name for †Lithomyrmex Carpenter.