Iridomyrmex obsidianus is a species of ant in the genus Iridomyrmex. Described by Carlo Emery in 1914, the species can only be found in New Caledonia.Emery, C. 1914f. Les fourmis de la Nouvelle-Calédonie et des îles Loyalty. Nova Caled. A Zool. 1: 393-437

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