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]}

• Mikko's Phylogeny Archive