Nacholapithecus kerioi was anape that lived 15-14 million years ago[1] during the MiddleMiocene. Fossils have been found in the Nachola formation in northernKenya. The only member of the genusNacholapithecus, it is thought to be a key genus in earlyhominid evolution. Similar in body plan toProconsul, it had a long vertebral column with six lumbar vertebrae, no tail, a narrow torso, large upper limbs with mobile shoulder joints, and long feet.[2]
Nacholapithecus was initially classified as belonging inKenyapithecus,[4] then attributed[5] toEquatorius (withEquatorius perhaps grouped into a subfamily Equatorinae, instead of both species in Afropithecini),[6][7] finally recognised by Ishidaet al. (1999) as a separate genus.[8][9][10] Classified perhaps as a member of the familyProconsulidae.[11]
Nacholapithecus kerioi is known from the lowest part of the Aka Aiteputh Formation, one of five formations in the Neogene System in Nachola,Samburu District, northern Kenya.[12][13] The formation is largely part of the north-western riftflank overlying the Nachola Formation.[14]
Ishida, H.; Pichford, M.; Nakaya, H.; Nakano, Y. (1984). "Fossil anthropoids from Nachola and Samburu Hills, Samburu District, Kenya".African Study Monographs. Supplementary Issue.2 (2):73–85.doi:10.14989/68314.
Ishida, H.; Tuttle, R.; Pickford, M.; Ogihara, N.; Nakatsukasa, M. (2006). Ishida, H.; Tuttle, R.; Pickford, M.; Ogihara, N.; Nakatsukasa, M. (eds.).Human Origins and Environmental Backgrounds. Developments in Primatology: Progress and Prospects. Springer.ISBN9780387296388.
Nakatsukasa, M.; Kunimatsu, Y. (May–June 2009). "Nacholapithecus and its importance for understanding hominoid evolution".Evolutionary Anthropology.18 (3):103–119.doi:10.1002/evan.20208.S2CID84530387.
Sawada, Y.; Saneyoshi, M.; Nakayama, K.; Sakai, T.; Itaya, T.; Hyodo, M.; Mukokya, Y.; Pickford, M.; Senut, B.; Tanaka, S. (2006). "The Ages and Geological Backgrounds of Miocene HominoidsNacholapithecus,Samburupithecus, andOrrorin from Kenya".Human Origins and Environmental Backgrounds. Developments in Primatology: Progress and Prospects. Springer. pp. 71–96.doi:10.1007/0-387-29798-7_6.ISBN978-0-387-29638-8.
Ward, S.; Brown, B.; Hill, A.; Kelley, J.; Downs, W. (1999). "Equatorius: A new hominoid genus from the middle Miocene of Kenya".Science.285 (5432):1382–1386.doi:10.1126/science.285.5432.1382.PMID10464093.
Zalmout, I. S.; Sanders, W. J.; MacLatchy, L. M.; Gunnell, G. F.; Al-Mufarreh, Y. A.; Ali, M. A.; Nasser, A.-A. H.; Al-Masari, A. M.; Al-Sobhi, S. A.; Nadhra, A. O.; Matari, A. H.; Wilson, J. A.; Gingerich, P. D. (2010). "New Oligocene primate from Saudi Arabia and the divergence of apes and Old World monkeys".Nature.466 (7304):360–364.Bibcode:2010Natur.466..360Z.doi:10.1038/nature09094.PMID20631798.S2CID205220837.