A handout illustration from the Wildlife Conservation Society shows a previously-undescribed sub-species of the saddleback tamarin monkey from the upper Amazon Basin, first noticed in 2007. Researchers have discovered this new sub-species of monkey in a remote part of the Amazon rain forest, a U.S.-based wildlife conservation group said on Tuesday, July 7, 2009. Credit: Stephen Nash/Wildlife Conservation Society/Handout

The newly found monkey was first spotted by scientists in 2007 in the Brazilian state of Amazonas and is related to the saddleback tamarin monkeys, known for their distinctively marked backs.

The small monkey, which is mostly gray and brown and weighs 213 grams (0.47 pound), has been named the Mura’s saddleback tamarin after the Mura Indian tribe of the Purus and Madeira river basins where the new sub-species was found.