Dolichoderus vexillarius is an extinct species of Eocene ant in the genus Dolichoderus. Described by William Morton Wheeler in 1915, a fossilised worker was found and described from the Baltic amber.Wheeler, W. M. 1915i . The ants of the Baltic Amber. Schr. Phys.-Ökon. Ges. Königsb. 55: 1-142 (page 83, fig. 37 worker described)
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