recognized, including A. magnus, A. bruni, A. collinsonae, A. parisiensis, and A. sudrei. Recent research showed that some fossil humeri of Adapis exhibit morphology that is comparable to living active arboreal quadrupeds. The evolutionary lineage from Adapis magnus to Adapis parisiensis exhibits reduced body size and canine size. Geographic and temporal range Adapis was first discovered in southern France. Fossils are known from the early Eocene, to the early Oligocene. The extinction of Adapis at the Eocoene-Oligiocene boundary has been considered to be the result of dramatic global cooling and drying. While North American and European adapiforms did not have access to geographic refuge to evade the cooler and drier conditions in the Northern latitudes, adapiforms in Asia were able to retreat to southern geographic regions that did not experience severe cooling and drying, enabling their survival until the Miocene. History of discovery The genus was first found and named by Georges Cuvier in 1821. This was the first Eocene primate ever discovered but was first mistakenly identified as an extinct genus of pachyderms. The true identity was not discovered until the 1870s where entire skulls were found in the Quercy region in southern France. Adapis and close relatives were also found in many fissure fillings in southern France. Paleobiology While the average body weight of Adapis is estimated to be about 2.0 kg, the genus is represented by an extremely wide range of body size across species compared to other adapiform genera. A. parisiensis appears to have been a medium-sized (compared to the large-bodied A. magnus with an estimated body mass of 8.4-9.0 kg), visually oriented, diurnal, sexually dimorphic arboreal folivore. Examinations of the dental microwear reveal striations on molar wear facets A. magnus, which suggests complex, three-directional mandibular movement during mastication. Adapis has been interpreted as having a diurnal activity pattern due to its small orbits. While some species of Adapis were mainly folivores, other species subsited on a diet that included some fruit. Based on other anatomical features, Adapis is thought to have been a climber rather than a leaper, and most likely had slow to medium slow locomotion. Horizontal movement was also a possibly important means of locomotion. In comparison with living primates, many researchers have considered the body size dimorphism in Adapis as indicative of a polygynous mating system. However, other have interpreted the fossils A. parisiensis as indicative of monogamy, suggesting the taxon was