Marca's marmoset
The Marca's marmoset is a species of marmoset that is endemic to the Amazon, in the Aripuanã-Manicoré interfluvium in Brazil. It is virtually unknown; in 2008 the IUCN noted that it had never been seen in the wild, though it has been observed since then. Probably, Mico manicorensis will be considered a synonymous of M. marcai.
