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Notharctus; Temporal range: Early-Mid Eocene (Wasatchian-Uintan); ~50.3–40.4 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Notharctus tenebrosus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Primates
Suborder:	Strepsirrhini
Family:	†Notharctidae
Subfamily:	†Notharctinae
Genus:	†Notharctus; Leidy, 1870
Species
	†N. pugnax; †N. robustior; †N. tenebrosus; †N. venticolus;
Synonyms
	Hipposyus Leidy 1872; Limnotherium Marsh 1871; Telmalestes Marsh 1872; Thinolestes Marsh 1872; Tomitherium Cope 1872;

Notharctus is a genus of adapiform primate that lived in North America and Europe during the late to middle Eocene.^[1]

The body form of Notharctus is similar to that of modern rats. Its fingers were elongated for clamping onto branches, including the development of a thumb. Its spine is flexible and the animal was about 40 centimetres (16 in) in length, excluding the long tail.^[2]

There were at least four different Notharctus species.^[1] Fossils from at least seven other potential species have also been discovered.^{[citation needed]}

References

^ ^a ^b Gebo 2002, p. 25.
^ Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 287. ISBN 1-84028-152-9.