''Iridomyrmex obscurans'' is an

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

species of

ant Ants are eusocial insects of the family Formicidae and, along with the related wasps and bees, belong to the order Hymenoptera. Ants evolved from vespoid wasp ancestors in the Cretaceous period. More than 13,800 of an estimated total of 22 ...

in the subfamily

Dolichoderinae Dolichoderinae is a subfamily of ants, which includes species such as the Argentine ant (''Linepithema humile''), the erratic ant, the odorous house ant, and the cone ant. The subfamily presents a great diversity of species throughout the world ...

. Described by Frank Carpenter in 1930, the fossil was discovered in the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

, but unfortunately nothing much is known about this ant.Carpenter, F. M. 1930. The fossil ants of North America. ''Bulletin of the Museum of Comparative Zoology'' 70:1-66. PDF
123533

References

† Fossil ant taxa">Iridomyrmex">† Fossil ant taxa Hymenoptera of North America">Fossil_ant_taxa.html" ;"title="Iridomyrmex">† Fossil ant taxa">Iridomyrmex">† Fossil ant taxa Hymenoptera of North America Fossil taxa described in 1930 Taxa named by Frank M. Carpenter {{Iridomyrmex-stub