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Allen's Swamp Monkey

Allenopithecus nigroviridis (species), “Blackish-Green Guenon”

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The Allen's swamp monkey (Allenopithecus nigroviridis) is a primate species categorized in its own genus Allenopithecus in the Old World monkey family. Phylogenetically, it is a sister clade to the guenons, but differs in dentition and habits. Allen's swamp monkey was named after American zoologist Joel Asaph Allen.

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