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Roosmalens' dwarf marmoset (Callibella humilis or Callithrix (Calibella) humilis), also known as the black-crowned dwarf marmoset, is a small New World monkey native to the Amazon Rainforest, on the east bank of the lower Madeira River, and the west bank of the Aripuanã River, in Brazil.
Stephen Nash's titi (Callicebus stephennashi), also known as just Nash's titi or Stephen Nash's monkey, is a species of titi, a type of New World monkey, endemic to the eastern bank of the Purus River in Brazil.