Luo, Z.-X. Gingerich, P. D. 1999 Terrestrial Mesonychia to aquatic Cetacea: transformation of the basicranium and evolution of hearing in whales University of Michigan Papers on Paleontology 31 1-98 Ungulates Heptodon Diacodexis Hapalodectes Dissacus Sinonyx Pakicetus Ambulocetus Gaviacetus Rodhocetus Indocetus Habib_Rahi_whale Dorudon Basilosaurus Zygorhiza Xenorophus Squalodon Physeter Mesoplodon Tursiops Parietobalaena Eubalaena Balaenoptera Osteology Maximum Parsimony Based on reanalysis of the original matrix. Luo_et_Gingerich_1999a