Phylogenomic systematics of the spotted skunks (Carnivora, Mephitidae, Spilogale): Additional species diversity and Pleistocene climate change as a major driver of diversification

•The southern United States/northeastern Mexico was the cradle of diversity for spotted skunks.•Despite origins of the genus in the Early Pliocene, glacial-interglacial cycles across the Pleistocene acted as the major driver of diversification.•We suggest recognizing seven of eight genetically distinct lineages of Spilogale as full species with an additional three subspecies.•Patterns of genetic diversity uncovered have implications for our understanding of the evolution of delayed implantation as well as for conservation management.