Eulithomyrmex

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.

Identification
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.

Distribution
Found only in Florissant shale (Oligocene) in the United States.

Castes
Queens, males and workers known.

Nomenclature

 * † 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.

Additional References

 * Carpenter, F. M. 1930. The fossil ants of North America. Bull. Mus. Comp. Zool. 70: 1-66
 * Carpenter, F. M. 1935. A new name for Lithomyrmex Carp. (Hymenoptera). Psyche (Camb.) 42: 91
 * Ward, P.S., Brady, S.G., Fisher, B.L. & Schultz, T.R. 2010. Phylogeny and biogeography of Dolichoderinae ants: effects of data partitioning and relict taxa on historical inference. Systematic Biology 59: 342-362