The Red-mantled saddleback tamarin[1] (Leontocebus lagonotus) is a species of saddleback tamarin, a species of small South American monkey.
- The red-mantled saddleback tamarin was once thought to be a subspecies of the brown-mantled tamarin Leontocebus fuscicollis.
- It has a head and body length of between 220 millimeters (8.7 in) and 270 millimeters (11 in), with a tail length of between 275 millimeters (10.8 in) and 330 millimeters. (13 inches) long.
- It weighs between 350 grams (12 oz) and 400 grams (14 oz).