At present, fairy armadillos have the least molecular data available within the armadillo family. This genus includes only two living species of fairy armadillo: Chlamyphorus truncatus (pink fairy armadillo) and Chlamyphorus retusus (chacoan or greater fairy armadillo). These two species are morphologically similar: both have notably reduced eyes and reinforced forearms that support enlarged digging claws. It is also one of few mammals that does not have external ears visible.