Family Erethizontidae Bonaparte, 1845 . Cat. Meth. Mamm. Europe, p. 5.

COMMENTS: Spelled Erithizontidae by Corbet and Hill (1980:189); but see comment under Erethizon . Extinct forms date to the Oligocene of South America. The genus Chaetomys is moved to Echimyidae based on its retention of the deciduous premolars and other dental features (see Patterson and Wood, 1982:394), although retained in Erethizontidae by Corbet and Hill (1991:200).