Figure 1 in The phylogeny and taxonomy of Hippopotamidae (Mammalia: Artiodactyla): a review based on morphology and cladistic analysis

Figure 1. Synthesis of recent phylogenies (Harrison, 1997; Weston, 2000) for the family Hippopotamidae. The genus Hexaprotodon is shown to be paraphyletic, and Hippopotamus being related to the derived species Hex. protamphibius. The important position of Hex. harvardi and the early divergence of the Hex. liberiensis lineage can be also noted.