A paper I was involved in with lead author Greg Jongsma (Florida Museum of Natural History) concerning the diversity and biogeography of the genus Amnirana across sub-Saharan Africa was just published in MPE. The paper is the most comprehensive analysis of this group to date, including samples from 22 African countries.
Using a mixture of mitochondrial and nuclear genes, we reconstructed evolutionary relationships and divergence times for 10 of the 12 African species, finding that the African members of this group diverged from their Asian relatives around 37 million years ago. With our dense geographic sampling we discovered a wealth of cryptic diversity that is not yet recognised by current taxonomy (up to seven species! – sound familiar?)
Furthermore, by modelling biogeographic dispersal and vicariance events, we gained a sense of the evolution of this group and in particular the importance of forest refugia in the Lower and Upper Guinean Forests, which have acted as a major centre of diversification in Africa.
You can read the paper here.