Infraorder Platyrrhini Geoffroy Saint-Hilaire, 1812 see Parvorder Platyrrhini Geoffroy Saint-Hilaire, 1812 Family Atelidae Gray, 1825 Subfamily Pitheciinae Mivart, 1865 Genus †Xenothrix Williams & Koopman, 1952 - Jamaican monkey 1 †Xenothrix mcgregori Williams & Koopman, 1952