Leakey 1959 established Zinjanthropus boisei based on the holotype OH 5. The species name 'boisei' is widely used and accepted but most place the species in the genus Paranthropus (e.g. Suwa et al. 1997; Wood and Constantino, 2007; Maclatchey et al. 2010) or Australopithecus (e.g. Lockey et al. 2020).