Английская Википедия:Altiatlasius

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Шаблон:Short description Шаблон:Speciesbox

Altiatlasius is an extinct genus of mammal, which may have been the oldest known primate, dating to the Late Paleocene (c.57 ma) from Morocco. The only species, Altiatlasius koulchii, was described in 1990.

Its true taxonomic position remains controversial. It has also been suggested that it should be classified as a plesiadapiform (an extinct group of arboreal mammal thought to be ancestral to primates) or that it should be recognized as a euprimate, either as an omomyid (a branch of fossil primates thought to be closely related to tarsiers), an early tarsiiform, or the oldest stem simian (monkeys and apes).

Evolutionary history and taxonomy

Altiatlasius koulchii, potentially the oldest known euprimate,Шаблон:Sfn is known only from ten isolated upper and lower molars and a fragment of a mandible.Шаблон:EfnШаблон:SfnШаблон:Sfn These fossils date to the Late Paleocene, approximately 57 million years ago,Шаблон:Efn and come from the Jbel Guersif Formation in the Ouarzazate Basin of Morocco.Шаблон:Sfn First described in 1990 by Sigé et al., Altiatlasius was originally proposed to be an omomyid, possibly close to the split with simians (monkeys and apes). It has also been classified in the family Toliapinidae, a type of plesiadapiform found in Europe.Шаблон:SfnШаблон:Sfn Other classifications assume they are stem euprimates, eosimiid-like simians,Шаблон:Sfn or an early tarsiiform.Шаблон:Sfn Many authorities consider Altiatlasius to be the oldest stem simian.Шаблон:SfnШаблон:Sfn Godinot (1994) and Bajpai et al. (2008) both support the view that it is an early anthropoid (simian).[1]

Together with the Early to Middle Eocene fossil primate Algeripithecus (originally thought to be the oldest crown simian) from Algeria, Altiatlasius helped strengthen the argument for an African origin of simian primates.Шаблон:Sfn However, when additional fossil remains of Algeripithecus were found, it was shown to be a strepsirrhine primate instead of a haplorhine, placing it with the azibiids,Шаблон:Sfn a group thought to be most closely related to lemuriforms (living lemurs and lorisoids).Шаблон:Sfn Because Algeripithecus was radically reclassified with the discovery of more fossils, equally fragmentary remains of Altiatlasius leave its phylogenetic affinities questionable. Also, the 20 million year gap in the fossil record between Altiatlasius and the first parapithecoids raises questions about the validity of the African origins hypothesis for simians.Шаблон:Sfn

Notes

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References

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Literature cited

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Шаблон:Haplorhini Шаблон:Taxonbar