Gentry, A. W. Hooker, J. J. 1988 235-272 The Phylogeny and Classification of the Tetrapods, Volume 2: Mammals Clarendon Press Oxford Benton, M. J. Outgroup Entelodontidae Tayassuidae Suidae Cebochoeridae Achaenodon Helohyus Raoellidae Gobiohyus Choeropotamidae Anthracotherium Anthracothema Bothriodontinae Hippopotamidae D_pakistanensis Bunomerycidae Agriochoeridae Merycoidodontidae Mixtotheriidae Cainotheriidae Anoplotheriinae Dacrytheriinae Xiphodontidae Protoceratidae 0romerycidae Camelidae Leptochoeridae D_metsiacus Microsus Antiacodon Homacodon Protodichobune D_varleti Messelobunodon Dichobuninae Hyperdichobuninae Amphimerycidae Hypertragulidae Tragulidae Leptomerycidae Osteology Maximum Parsimony Based on reanalysis of the original matrix. Gentry_et_Hooker_1988a