Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Primates Linnaeus, 1758 - primates
       Suborder Haplorrhini Pocock, 1918 see Suborder Haplorhini Pocock, 1918
         Infraorder Simiiformes Haeckel, 1866
           Parvorder Platyrrhini Geoffroy Saint-Hilaire, 1812
             Family Cebidae Bonaparte, 1831 - New World monkeys
               Subfamily Callitrichinae Gray, 1821 see Family Callitrichidae Gray, 1821
                 Genus Callithrix Erxleben, 1777 - marmosets
                   .1 Subgenus Callithrix Erxleben, 1777
                   .2 Subgenus Mico Lesson, 1840 see Genus Mico Lesson, 1840
                   .3 Subgenus Cebuella Gray, 1866 see Genus Cebuella Gray, 1866
                   .4 Subgenus Calibella van Roosmalen & van Roosmalen, 2003
                   01 Callithrix acariensis M. van Roosmalen et al., 2000 - Acari marmoset
                   02 Callithrix argentata (C. Linnaeus, 1771) - silvery marmoset
                   03 Callithrix aurita (É. Geoffroy Saint-Hilaire, 1812)
                   04 Callithrix chrysoleuca (Wagner, 1842)
                   05 Callithrix emiliae (Thomas, 1920)
                   06 Callithrix flaviceps (Thomas, 1903)
                   07 Callithrix geoffroyi (Humboldt, 1812) - Geoffroy's marmoset
                   08 Callithrix humeralifera (É. Geoffroy Saint-Hilaire, 1812)
                   09 Callithrix humilis M. van Roosmalen et al., 1998
                   10 Callithrix intermedia Hershkovitz, 1977
                   11 Callithrix jacchus (C. Linnaeus, 1758) - common marmoset
                   12 Callithrix kuhlii Coimbra-Filho, 1985
                   13 Callithrix leucippe (Thomas, 1922)
                   14 Callithrix manicorensis M. van Roosmalen et al., 2000 - Manicore marmoset
                   15 Callithrix marcai Alperin, 1993
                   16 Callithrix mauesi Mittermeier et al., 1992
                   17 Callithrix melanura (É. Geoffroy Saint-Hilaire, 1812)
                   18 Callithrix nigriceps Ferrari & Lopes, 1992
                   19 Callithrix penicillata (É. Geoffroy Saint-Hilaire, 1812) - black ear-tufted marmoset
                   20 Callithrix pygmaea (Spix, 1823)
                   21 Callithrix saterei Souse e Silva Jr. & Noronha, 1998