The well-known fig-fig wasp and yucca-yucca moth mutualisms have been shaped by million years of coevolution. The intimacy and specificity of these associations have led to predictions that pollination by specialist seed feeders offers an opportunity for joint speciation and causes rapid, simultaneous diversification in both partner lineages. I focus on a recently discovered, analogous mutualism between Phyllanthus shrubs and Epicephala moths to test this hypothesis. Phyllanthus is a pantropical genus of >1,200 species, and nearly half of the species are obligately associated with species-specific Epicephala. Molecular phylogenetic analysis of Phyllanthus shows that species pollinated by the moths group into six distinct clades, offering a useful opportunity to test correlated shifts in diversification rates using phylogenetically independent contrasts. Results indicate that Epicephala-pollinated lineages are more diverse and have higher speciation rates than their non-moth-pollinated sister clades, suggesting a link between specialized pollination system and accelerated diversification. Availability of increasingly large molecular phylogenies, coupled with recent methodological advances in analyzing rates of diversification using such data, provides promising approaches for investigating ecological correlates of diversification in various organisms.