Original description: Geoffroy Saint-Hilaire, I. (1851). Catalogue méthodique de la collection des mammifères, de la collection des oiseaux et des collections annexes. Paris: Gide et Baudry.
Comments: Split from S. fuscicollis (Matauschek et al., 2011).[5]
^Groves, C.P. (2007). "The taxonomic diversity of the Colobinae of Africa". Journal of Anthropological Sciences. 85: 7–34.
^ abGregorin, R. (2006). "Taxonomia e variação geográfica das espécies do gênero Alouatta Lacépède (Primates, Atelidae) no Brasil". Revista Brasileira de Zoologia. 23: 64–144. doi:10.1590/S0101-81752006000100005.
^Brandon-Jones, Douglas (2006). "Apparent Confirmation that Alouatta villosa (Gray, 1845) is a Senior Synonym of A. pigra Lawrence, 1933 as the Species-Group Name for the Black Howler Monkey of Belize, Guatemala and Mexico". Primate Conservation. 2006 (21): 41. doi:10.1896/0898-6207.21.1.41. S2CID85602926.
^ abcdeMatauschek, Christian; Roos, Christian; Heymann, Eckhard W. (2011). "Mitochondrial phylogeny of tamarins (Saguinus, Hoffmannsegg 1807) with taxonomic and biogeographic implications for the S. nigricollis species group". American Journal of Physical Anthropology. 144 (4): 564–574. doi:10.1002/ajpa.21445. PMID21404233.
^Rylands, A.B.; Mittermeier, R.A. (2009). "The diversity of the New World primates (Platyrrhini): An annotated taxonomy". In Garber, P.A.; Estrada, A.; Bicca-Marques, J.C.; Heymann, E.W.; Strier, K.B (eds.). South American Primates. Springer Science+Business Media, LLC. pp. 23–54. doi:10.1007/978-0-387-78705-3. ISBN978-0-387-78704-6.
^ abBurrows, Anne M.; Nash, Leanne T. (2007). "Introduction: Evolution, morphology, and behavior of lorisoid primates". American Journal of Primatology. 69: 1–5. doi:10.1002/ajp.20321. S2CID84314883.
^ abHarrison, Terry (2011). "Galagidae (Lorisoidea, Primates)". Paleontology and Geology of Laetoli: Human Evolution in Context. Vertebrate Paleobiology and Paleoanthropology. pp. 75–81. doi:10.1007/978-90-481-9962-4_5. ISBN978-90-481-9961-7.