Inferred phylogenetic relationships within Nannomys . Maximum likelihood phylogenetic tree of Nannomys is based on the combined dataset of mitochondrial (CYTB) and nuclear (IRBP) genes. Black circles indicate the support by both ML (bootstrap values > 75%) and BI (posterior probabilities > 0.95) analyses; grey circles indicate nodes supported by only one analysis. MOTUs were identified by the combination of GMYC approach and distribution of genetic distances on CYTB. Only outgroups from the genus Mus are shown. GenBank accession numbers correspond to CYTB sequences, for IRBP numbers see Additional file 1. Abbreviations of countries: BE: Benin, BF: Burkina Faso, BOT: Botswana, BUR: Burundi, CAM: Cameroon, CAR: Central African Republic, CI: Côte d’Ivoire, CON: Congo, DRC: Democratic Republic of Congo, ETH: Ethiopia, GAB: Gabon, GUI: Guinea, KE: Kenya, MAL: Mali, MOZ: Mozambique, MW: Malawi, NIG: Niger, RWA: Rwanda, SA: South Africa, SEN: Senegal, TOG: Togo, TCH: Tchad, TZ: Tanzania, ZA: Zambia.