<==o MEGATHERIA McKenna & Bell, 1997
|--o BRADYPODOIDAE Gray, 1821 [Bradypidae Gray, 1821; Bradypodoidea Simpson, 1931]
| `--o Bradypodidae Gray, 1821 [Synonyms]
| `--o Bradypus Linnaeus, 1758 [Synonyms] (kolmivarvaslaiskiaiset)
| |-- (Scaeopus) torquatus (harjalaiskiainen)
| `--o (Bradypus) Linnaeus, 1758
| |-- B. (B.) variegatus (ruskeakaulalaiskiainen)
| `-- B. (B.) tridactylus (kolmivarvaslaiskiainen)
`--o MEGATHEROIDEA Gray, 1821 [Synonyms]
|-- †Megatheriidae Gray, 1821 (jättiläislaiskiaiset) [Synonyms]
`-- Megalonyctidae Gervais, P., 1855 (kaksivarvaslaiskiaiset) [Synonyms]
Reference(s):
Carroll, R. L., 1988: Vertebrate paleontology and evolution.
–W. H. Freeman and company, New York, 1988, 698
Carroll, R. L., 1988: Appendix. 594-648
in Carroll, R. L., 1988: Vertebrate paleontology and evolution.
–W. H. Freeman and company, New York, 1988, 698
McKenna, M. C. & Bell, S. K., (eds.) 1997: Classification of mammals – above the species level.
–Columbia University Press, New York, 1997, xii-631
Nowak, R. M., 1991: Walker's Mammals of the World; Part 1.
–The Johns Hopkins University Press, Baltimore and London, 1991, xlviii-642-lxiii
Nowak, R. M., 1991: Walker's mammals of the World; Part 2.
–The Johns Hopkins University Press, Baltimore and London, 1991, xii-643-1629