In
addition, six new species of the subgenus Callicebus
were described in the last 15 years. Kobayashi &
Langguth (1999) described C. coimbrai (Callicebus
personatus species group) based on five specimens
collected in three locations near the coast of the
state of Sergipe, between the São Francisco and Real
rivers in northeastern Brazil. Roosmalen et al. (2002)
described two new species.