Evolution of Homo Linear evolution Homo sapiens Homo erectus A. Robustus A. afarensis A. africanus Habilis based models 1. Homo sapiens Homo erectus Homo habilis A. boisei A.robustus A. africanus A. afarensis 2. Homo sapiens Homo erectus A.Boisei A.Robustus Homo habilis A.africanus A.afarensis 3. Homo sapiens Homo erectus A.boisei A.robustus Homo habilis A.africanus A.afarensis UNKNOWN 3 branch theory of Alan Walker (Pre 1990s) Homo sapiens Homo erectus Homo habilis P. boisei Paranthropus aethiopicus A. afarensis P robustus A. africanus Homo sapiens 1 Two Branch model Johanson White model A boisei 1.8-1 Homo erectus 1 A robustus (2-1) Homo habilis 2-1.5 A africanus (2) A afarensis 3mya H sap HN A boisei 1.5- 1 H erectus <1 A robustus 1.5 - 1 H ergaster 1-2 H habilis 1-2 A aethiopicus 2-3 mya A africanus A afarensis A anamensis 3.5 Kenanthropus platyops 3.5 A. Ramidus 4.25 Ardipithecus kadabba 5