Abstract
Two species of warthogs (Phacochoerus), differing by the number of functional incisors, were described in the Holocene fossil record: the common warthog (P. africanus), widespread in sub-Sahar-an Africa, and the Cape, or desert warthog (P. aethiopicus), which was considered extinct since 1896, but was recently rediscovered in East Africa by morphological analyses. Mitochondrial and single-copy nuclear DNA sequences show that common and desert warthogs belong to two deeply divergent monophyletic lineages, that might have originated in the last part of the Pliocene. The finding of two genetically divergent extant species of warthogs highlights the importance of molecular methods applied to the knowledge and conservation of biodiversity in Africa, to uncover the tempo and mode of its species evolution.
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