Armadillos belong to Order Cingulata both sloths and anteaters belong to Order Pilosa (“hairy”). The armadillos are more distant relatives to these animals, while sloths and anteaters are fairly closely related. There are three groups of animals within the order Xenarthra: Sloths, anteaters and armadillos. Other mammals do not have this particular bony bump. Xenarthrans are defined by the xenarthrous process, a small spur of bone found on the lumbar vertebrae that helps to stiffen the spine. This is a relatively small branch of mammals that developed in isolation in South America around 50,000,000 years ago. Superorder Xenarthra: Sloths, Anteaters and ArmadillosĪrmadillos are members of the superorder Xenarthra (“xenarthra” means “strange joint”).
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