Iridomyrmex florissantius is an extinct species of ant in the subfamily Dolichoderinae. It was described by Frank M. Carpenter in 1930 after a fossil was found in the United States.Carpenter, F. M. 1930. The fossil ants of North America. Bulletin of the Museum of Comparative Zoology 70:1-66. [1930-01] PDF 123533
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