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In 1973 a Bernard Ngeneo (led by Richard Leakey) found a cranium in the East Rudolf Region of Kenya
Koobi fora

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Cranium size and form
Legs (Large head, robust shaft)
Steep forehead
752cc (Cranial capacity)
complex crowns
Homo halabis
Bipedal
Lack of cranial crest and strong muscle markings

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Wide and short palate
Brow ridge
flat fronted
Long molars
Thick dental enamel
More ape-like

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Originally V.P. Alexeev had named KMN-ER 1470 ( the original cranium found in Kenya) Pithecanthropus rudolfensis in 1986

Name changed by Colin P. Groves 3 years later to its current name Homo rudolfensis

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Early Pleistocene (2.4-1.8 million years ago)
Grassland environment

H. halabis
H. erectus

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New hominid species
split tree
Kenyanthropus platyops (Richard Leakey) East Africa
3.3-3.5 mya
Zygomatic arch
Flat face
Brainsize
Sister Group

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Tough foods (H. halabis)
Plant material, meat
robust masticatory apparatus

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No tools found with fossils
Oldowan

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Originally not given a species
H. Halabis
Different sexes
Different species

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Argue , D. (2017, August 16). Homo rudolfensis. Researchgate. Retrieved November 2, 2022, from https://www.researchgate.net/publication/318147288_Homo_rudolfensis

Dorey, F. (2018, November 4). Homo rudolfensis. The Australian Museum. Retrieved November 2, 2022, from https://australian.museum/learn/science/human-evolution/homo-rudolfensis/

Welker, B. H. (2017, June 13). 24. Homo rudolfensis. The History of Our Tribe Hominini. Retrieved November 2, 2022, from https://milnepublishing.geneseo.edu/the-history-of-our-tribe-hominini/chapter/homo-rudolfensis/