Molecular characterization of from the black-faced spider monkey () with phylogenetic inference of relationships among of Neotropical primates.

Species of the genus are parasitic nematodes of the family Onchocercidae (Nematoda; Filarioidea) which infect the peritoneal cavity of Neotropical primates. Of these, six species have been taxonomically described, two of these have been reported infecting the black-faced spider monkey (): and . Description of species have been based on morphological characteristics, and their phylogenetic relationships remain unresolved.