Boisserie, J.-R. 2005 The phylogeny and taxonomy of Hippopotamidae (Mammalia: Artiodactyla): a review based on morphology and cladistic analysis Zoological Journal of the Linnean Society 143 1-26 Anthracokeryx_ulnifer Hex_mingoz Hex_cf_mingoz Hex_bruneti Hex_harvardi Hex_cf_protamphibius Hex_protamphibius Hex_karumensis Hex_aethiopicus Hex_sivalensis Hex_palaeindicus Hex_afarensis Hip_amphibius Hip_gorgops Hex_liberiensis Osteology Maximum Parsimony Based on reanalysis of the original matrix. Boisserie_2005a