Callitrichids as phyletic dwarfs, and the place of the callitrichidae in platyrrhini
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Cebuella, Callithrix, Leontopithecus, andSaguinus share five distinguishing features. All of these features are best interpreted as derived character states within Platyrrhini, and these animals are phyletic dwarfs. These derived traits may form a single complex that evolved as a result of dwarfing. Two changes in the dentition are shown to be correlated with dwarfing in mammals. These four platyrrhine genera may or may not form a monophyletic group. It is suggested thatCallimico is an “incipient dwarf platyrrhine.” Causes of dwarfing in mammals are discussed.
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