The Marca's marmoset (''Mico marcai'') is a species of

marmoset The marmosets (), also known as zaris or sagoin, are 22 New World monkey species of the genera '' Callithrix'', '' Cebuella'', '' Callibella'', and ''Mico''. All four genera are part of the biological family Callitrichidae. The term "marmoset" ...

that is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

to the

Amazon Amazon most often refers to: * Amazons, a tribe of female warriors in Greek mythology * Amazon rainforest, a rainforest covering most of the Amazon basin * Amazon River, in South America * Amazon (company), an American multinational technolog ...

, in the

Aripuanã Aripuanã is a municipality in the state of Mato Grosso in the Central-West Region of Brazil. It is located on the banks of the Aripuanã River Aripuanã River ( pt, Rio Aripuanã) is a river in the Mato Grosso and Amazonas states in north-w ...

Manicoré Manicoré is a municipality located in the south-east of the Brazilian state of Amazonas. Location The population of Manicoré was 56,583 (2020) and its area is 48,282 km2. The town is located on the banks of the Madeira River about downst ...

interfluvium in

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

. Its body is light grey, with orange legs, a black tail, a pinkish face, and naked ears. It is about long, excluding the tail, and it has a long tail. It weighs about . It was previously thought to be virtually unknown; in 2008 the IUCN noted that it had never been seen in the wild, though it has been observed since then.Silva, et al. (2013)
Rediscovery of Marca's marmoset and the challenges for its conservation.
However, later studies found the Manicore marmoset (''Mico manicorensis''), discovered in the

Campos Amazônicos National Park The Campos Amazônicos National Park ( pt, Parque Nacional dos Campos Amazônicos) is a National park in the states of Rondônia, Amazonas and Mato Grosso, Brazil. Location The Campos Amazônicos National Park covers parts of the municipalities ...

in 2000, to be conspecific with ''M. marcai,'' and thus both were synonymized.

References

Mico (genus) Mammals of Brazil Endemic fauna of Brazil Mammals described in 1993 {{newworld-monkey-stub