Tremacebus

Tremacebus is an extinct genus of New World monkeys from the Early Miocene (Colhuehuapian in the SALMA classification). The type species is T. harringtoni.

Tremacebus Temporal range: Early Miocene (Colhuehuapian) ~21.0–17.5 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Skull of Tremacebus harringtoni
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Primates
Suborder:	Haplorhini
Infraorder:	Simiiformes
Family:	Aotidae
Genus:	†Tremacebus Hershkovitz, 1974
Species:	†T. harringtoni
Binomial name
†Tremacebus harringtoni (Rusconi, 1933)

Description

Tremacebus was about 1 metre (3.3 ft) in length, and would have resembled a modern night monkey, to which it may have been related,^[1] though possibly a stem aotid.^[2] However, its eyes appear to have been smaller than the modern species, CT scans of the cranium suggest a relatively small olfactory bulb and poor sense of smell, compared with night monkeys. These features suggest that it may not have been nocturnal.^[3] It had an estimated body mass of 1.8 kg (4.0 lb).^[2]

Only a few fossils have been found, including a skull from the Sarmiento Formation, Patagonia.^[4]