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Se describen los cariotipos bandeados (bandas Q, R, C y G) de cuatro ejemplares del género Callicebus, de procedencia desconocida, cautivos en zoológicos colombianos. Dos de ellos determinados como C. cupreus ornatus, subespecie endémica colombiana, presentaron un cariotipo diferente a los descritos hasta la fecha para dicho género, con 44 cromosomas (2n = 44: 16Bi, 26 A). Los cariotipos de los otros ejemplares, un macho de C. cupreus cf. discolor (2n= 46: 16Bi, 28A) y una hembra de C. torquatus (2n=20: 8Bi, 10A) son similares a los descritos previamente. Una fusión (o fisión) telomérica que involucra a los cromosomas 1 y 20 de C. c. cf. discolor y el cromosoma 1 de C. c. ornatus podrían ser responsables de la variación en el número diploide de estas dos subespecies. La complejidad de la reorganización cromosómica mencionada sugiere el inicio del aislamiento reproductivo entre estos dos taxones.
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