High Quality Content by WIKIPEDIA articles! Pachyarmatherium is an extinct large armadillo-like cingulate genus of North and South America from the Pliocene and Pleistocene epochs, related to the extant armadillos and the extinct pampatheres and glyptodonts. It was present from 4.9 Mya—300,000 years ago, existing for approximately 4.6 million years.