Dictionary of Human Evolution and Biology

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Callithrix Erxleben, 1777

Platyrrhine genus to which the true marmosets belong. Recent taxonomic revisions produced up to seventeen species. However, not all workers agree with these revisions; some see three highly diverse species (C. argentata, C. humeralifera, and C. jacchus), with subspecies. This interpretation is primarily supported by molecular genetics. Found in tropical rain forests south of the Amazon River in Brazil and eastern Bolivia. Diurnal. Arboreal quadrupeds who employ leaping. Digits have secondary claws (tegulae). Body mass ranges from 210 to 454 g. Dental formula: 2.1.3.2; enlarged incisors used for gnawing through bark; frugivorous, with insect supplements. Gummivorous during particular seasons. Social units said to be monogamous families, but some workers have disputed this. Birth of dizygotic twins is the norm.

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