Rodent Societies: An Ecological & Evolutionary Perspective

Figure 36.3 Phylogeographic trends in the Bathyergidae inferred from analysis of mitochondrial 12S rRNA and cyto-
chrome bsequence differences. (a) Initial divergence of the Heterocephalus(Het.) lineage from the common ancestor of
the family in East Africa; (b) Radiation of Heliophobius(Hel.) and movement from East Africa into Southern Africa, with
some populations crossing the Rift Valley (*); (c) Bathyergus(Ba.) and Georychus(Ge.) lineages diverge in South Africa;
(d) Cryptomys(Cr.) diverges into two clades, one radiating predominantly in South Africa (1), and the other spreading
north into Southern and Central Africa (2); (e) Formation of Lake Tanganyika (f) Later diversification ofCryptomysclade 2
in south-central Africa. (Data adapted from Faulkes et al. 2004).