Similar or Related Species
In addition to external appearance, the Peruvian spider monkey differs from the red-faced spider monkey by the number of chromosomes (2n = 32 in the red-faced vs. 2n = 34 in the Peruvian) in addition to several specific chromosomal differences. The two species have been interbred in captivity, resulting in offspring with reduced fertility (but not sterility). There are several related species such as the Central American spider monkey or Geoffroy's spider monkey (A. geoffroyi), and the brown spider monkey (A. hybridus) and the species' closest relative the white-bellied spider monkey (A. belzebuth). All of these have a prehensile tail, a thumbless hand, and other characteristics that are found in all spider monkeys.
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