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We are immensely grateful to the editors of this book, Drs. Beth Shook, Lara Braff, Katie Nelson, and Kelsie Aguilera, for their time and commitment to making this knowledge freely accessible to all, and for giving us the opportunity to participate in this important project.
Figure 8.2: A line diagram illustrates the many branches of, and probable relationships between, primates and their primate-like ancestors. Y axis lists time periods (bottom to top): Paleocene, Eocene, Oligocene, Miocene. Across the top are labeled extant primate groups (left to right): lorisiformes, lemuriformes, tarsiers, platyrrhines, cercopithecoids, apes.
From the bottom a vertical line emerges. It has three side branches in the Paleocene labeled Plesiadapiforms. From there it branches into a group labeled Adapoids during the Eocene and Oligocne. A disconnected side-branch leads further to groups of Omomyoids, Eosimiids, and Amphipithecids at roughly the same time period. Branches from Adapoids leads to Sivaladapids (Miocene) and Lorisiformes and Lemuriforms (present day). One disconnected branch connects Omomyoids to Tarsiers (present day). A disconnected branch from Eosimiids also leads to Tarsiers. Other disconnected branches from Eosimiids lead to Platyrrhines, Cercopithecoids, and Apes (all present day).
Figure 8.13: For the adapoid origin model, strepsirrhines, omomyoids, tarsiers, adapoids and anthropoids all share a common ancestor. Strepsirrhines were the first to diverge from the lineage leading to anthropoids, followed by omomyoids. Tarsiers diverged from the lineage leading to Omomyoids. Adapoids were the last to diverge from the lineage leading th anthropoids. For the tarsier origin model, strepsirrhines, omomyoids, tarsiers, adapoids and anthropoids similarly share a common ancestor. However in this model adapoids were the first to diverge from the lineage leading to anthropoids. Strepsirrhines later diverged from the adapoids. Then, omomyoids diverged from the lineage leading to anthropoids, followed by tarsiers. For the omomyoid origin model, like the tarsier model, adapoids first diverged and strepsirrhines later diverging from the lineage leading to adapoids. Omomyoids diverged after the adapoids. However, in this model tarsiers diverged from the lineage leading to omomyoids.