Afropithecus

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Afropithecus
Temporal range: 18–16 
Ma
Miocene
Skull cast
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Suborder: Haplorhini
Infraorder: Simiiformes
Superfamily: Hominoidea
Family: Afropithecidae
Genus: Afropithecus
Leakey & Leakey, 1986
Species:
A. turkanensis
Binomial name
Afropithecus turkanensis
Leakey & Leakey, 1986

Afropithecus is a genus of

type specimen of Afropithecus turkanensis is KNM-WK 16999.[1]

Morphology

Richard Leakey and Meave Leakey first described Afropithecus turkanensis to be a large hominoid which appeared to have relatively thick enamel.

quadruped similar to P. nyanzae, and that A. turkanensis had primitive facial morphology and derived dental characteristics that would suggest a diet of hard fruits. Leakey also synonymised Heliopithecus with Afropithecus.[3]

Cranial morphology

The type specimen, KNM-WT 16999 is composed of a long distinct

adult dentition; the right orbit (virtually complete), the right zygomatic, the pterygoid, most of the sphenoid and lesser wings, the maxilla and premaxilla, and adult dentition with procumbent incisors. The surface on the right side maxilla and premaxilla along with the enamel on the right molars has been lost over time and has been replaced with calcite crystals, which only provide the general shape and not the details.[1]

From dentition it is known that the palate, which is almost completely calcified, of A. turkanensis is shallow, long and narrow with tooth rows that converge posteriorly, and it is probable the tooth rows were originally nearly parallel. A. turkanensis had a 6.5mm

diastema between its very procumbent second incisor (KNM-WT 16999 had large, broad incisors) and the canine.[4]

The thickness of the enamel on the molars is often reported when fossils are being recorded and used to make comparisons across taxa. The thickness is referred to either as "thin" or "thick" and is commonly assessed as a linear measurement of the enamel on worn or naturally fractured teeth. From enamel testing it has been suggested that A. turkanensis is the oldest known thick-enamelled hominoid, which is what would distinguish it from Kenyapithecus.[4]

Post-cranial morphology

Post cranial remains such as KNM-WK 16901, includes an associated right fibula (lacking the proximal portion, and is approximately the same size as Pan troglodytes; 184 mm), a right proximal third

metatarsal, a right fourth metatarsal lacking the head, and an incomplete first metatarsal head.[1]

Other post-cranial remains include: KNM-WK 17016P a large right ulna, and foot or hand bones: KNM-WK 17008, KNM-WK 18395.[1]

Feeding

Morphological analysis of the teeth and palate of Afropithecus suggests that it utilized a sclerocarpic foraging diet similar to members of Pitheciidae, in contrast to that of Morotopithecus.[5]

See also

References

External links