The Collaborative International Dictionary of English v.0.48:

Aotus \Aotus\ n.
   1. 1 a genus of nocturnal South American monkeys with large
      eyes; the owl monkeys; the douroucoulis. See
      douroucouli.

   Syn: genus Aotus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Aotus
    n 1: douroucoulis [syn: Aotus, genus Aotus]