Evolutionary and ecological patterns within the South African Bathyergidae: Implications for taxonomy

摘要: Abstract The family Bathyergidae (comprising six genera) is a group of subterranean rodents endemic to sub-Saharan Africa. Our understanding the evolution and species richness South African bathyergid genera Georychus, Bathyergus Cryptomys limited, with majority listed as Least Concern by IUCN Red List Threatened Species. Genetic data suggest that several cryptic may be present in these genera. To explore genetic ecological distinctiveness, evaluate taxonomic across ranges lesser degree, Cryptomys, well possible scenarios which have historically influenced evolutionary patterns, we employed four protein coding markers (one mitochondrial three nuclear) along distribution wide sampling schemes large sample sizes. In addition, differences among different intra-generic clades were explored. Genera appear originated north-eastern interior Africa, following novel habitats created through Post-African I erosion cycle dramatic changes climate phytogeography. each genus, multiple geographically discrete lineages (clades) are supported both nuclear data. These bear signature fragmentation wider historical distributions major environmental since middle Miocene (major uplift events, II cycle, drainage river systems, sea-level fluctuations climatic vegetation shifts), thereby leading long-term isolation. Along protracted periods separation, it appears further delimit relation geology, phytogeographic preference, elevation, rainfall temperature. As such, two Georychus (Clades 1 2) one (Clade I) occur at higher elevations above Great Escarpment (in older deposits harbouring grassland vegetation, lower daily temperatures), remaining within 3, 4 5 Clades III IV Cryptomys) occupying low-land contrasting geological characteristics. Although significant variables also observed between clades, not consistent, given their largely distributions. results corroborate expand previous suggestions Bathyergidae.