- found: Carroll vert. paleo. and evol.: p. 554 (Order Xenarthra includes the armadillos (Suborder Cingulata), anteaters (Suborder Vermilingua), and sloths (Pilosa))
- found: Walker mam. world: v. 1, p. 515 (Infraorder Pilosa - sloths, made up of the superfamilies: Megalonychoidea and Mylodontoidea)
- 1986-02-11: new
- 1995-04-03: revised
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