Pachyarmatherium was named by Downing and White (1995). Its type is P. leiseyi.
It was assigned to Dasypodoidea by Downing and White (1995), and tentatively to Glyptodontidae by McKenna and Bell (1997).[2][3] A cladistic analysis performed by de O. Porpino et al. (2009) led to the conclusion that Pachyarmatherium is a sister group to a clade consisting of Glyptodontidae and Pampatheriidae.[1] Oliveira et al. (2013) suggest that Pachyarmatherium is a possible dasypodid.[4]
Fossil distribution of Pachyarmatherium
Life restoration of P. brasiliense (lower left) and contemporary animals
^K. F. Downing and R. S. White. 1995. The cingulates (Xenarthra) of the Leisey Shell Pit local fauna (Irvingtonian), Hillsborough County, Florida. Bulletin of the Florida Museum of Natural History 37(12):375-396
^M. C. McKenna and S. K. Bell. 1997. Classification of Mammals Above the Species Level 1-640
^Oliveira, É. V.; de O. Porpino, K.; da Silva, F. M. (2013). "New material of Pachyarmatherium from the late Pleistocene of northeastern Brazil: insights into its morphology and systematics". Paläontologische Zeitschrift. 87 (4): 505–513. Bibcode:2013PalZ...87..505O. doi:10.1007/s12542-013-0166-4. S2CID86778509.