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The origins and early evolution of primates is shrouded in mystery due to lack of fossil evidence. They are believed to have split from plesiadapiforms in Eurasia around the early Eocene or earlier. The first true primates so far found in the fossil record are fragmentary and already demonstrate the major split between strepsirrhines and ...
Simians (anthropoids) include monkeys and apes, which in turn includes humans. [13] CT image of the skull of Darwinius. Franzen et al. in their 2009 paper place Darwinius in the "Adapoidea group of early primates representative of early haplorhine diversification". This means that, according to these authors, the adapiforms would not be ...
This species was also found to be a very tiny primate, with mean estimates of body mass ranging from 91 to 179 grams (3.2 to 6.3 oz). E. sinesis was originally described on the basis of fragmentary fossils, but with the discovery of E. centennicus and a complete lower dentition, Eosimias can more definitively be described as an early anthropoid.
The origin of anthropoid primates was initially thought to be Africa, however, fossil evidence, now suggests they originated in Asia. During the middle to late Eocene, multiple groups of Asian anthropoids crossed the Tethys Sea on natural rafts or floating islands, colonizing Africa alongside other Asian mammals. The earliest African anthropoid ...
Aegyptopithecus fossils have been found in the Jebel Qatrani Formation of modern-day Egypt. Aegyptopithecus is believed to be a stem-catarrhine, a crucial link between Eocene and Miocene fossils. [2] Aegyptopithecus zeuxis has become one of the best known extinct primates based on craniodental and postcranial remains. [2]
Omomyidae is a group of early primates that radiated during the Eocene epoch between about (mya). Fossil omomyids are found in North America, Europe & Asia, making it one of two groups of Eocene primates with a geographic distribution spanning holarctic continents, the other being the adapids (family Adapidae).
The encephalization quotient of some cetaceans is therefore higher than that of most primates, including the nearest relatives of humans, such as Australopithecus. [8] This list follows partly from Walter Carl Hartwig's 2002 book The Fossil Primate Record [9] and John G. Fleagle's 2013 book Primate Adaptation and Evolution (3rd edition). [10]
P. cookei compared to Notharctus tenebrosus (left), an early true primate. Both come from Eocene Wyoming, though the latter is slightly geologically younger. Although the placement of the Plesiadapis lineage is still up for debate, the consensus in the 1970s was that they were closest to early tarsier-like primates. [5]