Taxonomic remarks on the South American Mastodons referred to Haplomastodon and Cuvieronius

New mastodon finds collected in the Province of Carchi (Northern Ecuador) give further evidence that in South America Haplomastodon and Cuvieronius are monospecific. Of all the specific names referred to the genus Haplomastodon, only chimborazi must be considered valid as it alone was based on significant diagnostic material. As far as the genus Cuvieronius is concerned a new type species, Cuvieronius tarijensis, is proposed as the type specimen of Cuvieronius hyodon likely belongs to Haplomastodon.