OH 24

Last updated
Twiggy
Homo habilis skull.jpg
Catalog no.OH 24
Common nameTwiggy
Species Homo habilis
Age1.8 mya
Place discovered Olduvai Gorge, Tanzania
Date discovered1968
Discovered by Peter Nzube

OH 24 (Olduvai Hominid No. 24) or Twiggy is a fossilized skull of the species Homo habilis . It was discovered in Olduvai Gorge, Tanzania by Peter Nzube in 1968. The skull was found crushed almost flat and was therefore named after the famously skinny model of the time Twiggy. Estimated at 1.8 mya (million years old), the cranium was found crushed flat and cemented together with a mass coating of limestone. [1] It is now a Smithsonian exhibit item. [1]

Contents


Remnants

"Twiggy", a fossilized cranium at Olduvai Gorge, Tanzania OH 24 replica 01.JPG
"Twiggy", a fossilized cranium at Olduvai Gorge, Tanzania
Fossilized skull "Twiggy" Twiggy - MCN 4144.jpg
Fossilized skull "Twiggy"


Originally, there was very little interest placed on the discovery of the skull, but after much effort by scientist Ron Clarke, the skull was finally reconstructed and examined thoroughly. Despite this effort, there still is a good deal of distortion from the fossilization processes that took place. The small cranial capacity estimated at 590-600 cc [2] (cubic centimeters) is in part attributed to this cranial distortion. [3] OH 24's face is described as being prognathic (projecting forward under the nose), as in other fossils from the Homo habilis family, but not quite to the extent of earlier Australopithecus species. Besides manifesting lesser prognathism than the australopithecines, OH 24 also portrays a larger cranial vault, indicating an expansion in brain size from its ancestor, and the reduction of facial prognathisim typical of the evolution of early Homo. [4]

The individual's third molars had erupted, which indicates that OH 24- "Twiggy" was an adult at death. Yet, these molars show no sign of wear (the points on the crowns of the teeth are still sharp, and show little sign of abrasion by rough food matter), indicating that this individual died soon after the eruption of these molars. [5] Like the other fossils of Homo habilis, OH 24 also manifests the slightly small teeth set in a U-shaped arch.

Dispute

Twiggy was used to settle disputes Homo habilis-MGL 95213-P4150645-black.jpg
Twiggy was used to settle disputes

Being one of the oldest fossils of Homo habilis, OH 24 has been used to settle many disputes about splitting some of the early Homo fossils that have been found into Homo rudolfensis and Homo habilis, or lumping them together into one single species, Homo habilis. Some of the highly disputed fossils are KNM-ER 1813 which most agree is a female Homo habilis and KNM-ER 1470 which many argue has various anatomical differences to the previously known Homo habilis fossils that should make it be classified into the Homo rudolfensis species.

OH 24 features a cranium and some parts of the skull Homo habilis skull (University of Zurich)-1.JPG
OH 24 features a cranium and some parts of the skull
Possible appearance of Twiggy, in sketch. HabilisZICA.png
Possible appearance of Twiggy, in sketch.
The skull of A Homo habilis Em - Homo habilis - 2.jpg
The skull of A Homo habilis

See also

References

  1. 1 2 Smithsonian (8 May 2014). "OH 24" . Retrieved 20 April 2014.
  2. ↑ Johanson, Donald and Blake Edgar (1996). From Lucy to Language. Simon and Schuster Editions. p. 172.
  3. ↑ Johanson D. Donald (1977). "Rethinking the origins of the genus Homo". In R. Duncan & M. Weston-Smith (ed.). Encyclopedia of Ignorance. pp. 243–250.
  4. ↑ Lavenda H. Robert & Schultz A. Emily (2011). Anthropology: What does it mean to be a Human?. Oxford University Press. p. 122.
  5. ↑ Smithsonian (8 May 2014). "OH 24". What does it mean to be a human?.
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