Jim Wetterer has a paper out in Myrmecological News detailing the global spread of the ghost ant Tapinoma melanocephalum. This diminutive dolichoderine is quite possibly the most widely distributed ant in the world, a hitchhiker on human globalization, thriving in the wake of human-wrought ecological destruction. Their cosmopolitan dominance reflects our own.
Oddly enough, we still don’t even know where they originally lived.
citation: Wetterer, J. K. 2008. Worldwide spread of the ghost ant Tapinoma melanocephalum (Hymenoptera: Formicidae). Myrmecological News 12, 23-33.