PMID: 11607143Jan 1, 1991Paper

Additional fossil evidence on the differentiation of the earliest euprimates

Proceedings of the National Academy of Sciences of the United States of America
Kenneth D Rose, T M Bown

Abstract

Several well-preserved jaws of the rare North American omomyid primate Steinius vespertinus, including the first known antemolar dentitions, have been discovered in 1989 and 1990 in the early Eocene Willwood Formation of the Bighorn Basin, Wyoming. They indicate that its dental formula is as primitive as those in early Eocene Donrussellia (Adapidae) and Teilhardina (Omomyidae)--widely considered to be the most primitive known euprimates--and that in various dental characters Steinius is as primitive or more so than Teilhardina. Therefore, despite its occurrence at least 2 million years later than Teilhardina, S. vespertinus is the most primitive known omomyid and one of the most primitive known euprimates. Its primitive morphology further diminishes the dental distinctions between Omomyidae and Adapidae at the beginning of the euprimate radiation

References

Jan 1, 1977·Folia primatologica; international journal of primatology·P D Gingerich
Aug 2, 1990·Nature·P D Gingerich
Jan 1, 1988·Folia primatologica; international journal of primatology·D L Gebo
Apr 26, 1974·Science·M Cartmill

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Citations

Mar 5, 2008·Proceedings of the National Academy of Sciences of the United States of America·K Christopher Beard
Jul 19, 2006·Proceedings of the National Academy of Sciences of the United States of America·Thierry SmithPhilip D Gingerich
Jul 14, 2007·Journal of Human Evolution·Mary T SilcoxEric J Sargis
Oct 17, 2015·Royal Society Open Science·Sergi López-TorresMary T Silcox
Jan 1, 2004·Nature·Xijun NiChuankui Li
Feb 4, 2005·Child's Nervous System : ChNS : Official Journal of the International Society for Pediatric Neurosurgery·Masaru HondaIzumi Nagata
May 6, 2003·Science·E Christopher KirkPierre Lemelin

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