Evolution
The chromosomal content of the ancestor species appears to have been 2n = 54. In extant species the 2n value varies from 16 in the titi monkey to 62 in the woolly monkey.
Read more about this topic: New World Monkey
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“The more specific idea of evolution now reached is—a change from an indefinite, incoherent homogeneity to a definite, coherent heterogeneity, accompanying the dissipation of motion and integration of matter.”
—Herbert Spencer (1820–1903)