Recently, Agnolin et al. (2019) described 14 new species of mammals, including 12 rodents, one bat, and one carnivore, and one new subspecies of rodent. In addition, these authors proposed several other nomenclatorial acts: some nominal forms were removed from synonymies and hypothesized as distinct species, at the time that three new genera, one subtribe, and one tribe of mammals were also named. We reviewed the merits of all nomenclatorial acts proposed by Agnolin at al. (2019) and concluded that all 14 new species and the new subspecies, as well as those forms removed from synonymies, should be treated as synonyms of already known species. We suggest the same regarding the three new supraspecific taxa presented by Agnolin et al., two of which are not available as they fail to comply with the provisions of the International Code of Zoological Nomenclature. We end this contribution criticizing the way that mammal taxonomy was approached by Agnolin et al. (2019).