Fig. 8.

Simplified phylogeny of Xenarthra and Afrotheria (after Hallström et al. 2007; Seiffert, 2007). Red lines: toothless lineages; blue lines: enamel-less lineages; green lines: enamel reduction. (A) Lateral view of the skull and detail of the upper cheek teeth of an aardvark, Orycteropus afer. (B) Ventral view of the skull and of the upper right jaw, and detail of extracted teeth of a nine-banded armadillo, Dasypus novemdelineatus. (C) Ventral view of the skull of a giant anteater, Myrmecophaga tridactyla. (D) Ventral view of the skull and detail of the upper jaw of a three-toed sloth. †Extinct lineages.