Brian Fisher has a paper out in Zootaxa this week describing a pair of new ant genera from Madagascar. Aptinoma and Ravavy are small ants in the subfamily dolichoderinae related to Tapinoma and Technomyrmex. Apparently, the backstory on these new ants is that ongoing genetic research from the Ant Tree of Life project revealed some Malagasy specimens to be rather distantly related to any of the previously described genera. On closer morphological inspection, Fisher found several differences that allow for the new genera to be reliably diagnosed.
Yet another illustration that the more we look, the more biological diversity we find.
source: Fisher, B. L. 2009. Two new dolichoderine ant genera from Madagascar: Aptinoma gen. n. and Ravavy gen. n. (Hymenoptera: Formicidae). Zootaxa 2118: 37-52.