Thylacosmilus atrox Riggs, 1933 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Chordata class Mammalia family Thylacosmilidae genus Thylacosmilus species Thylacosmilus atrox Name Synonyms Achlysictis lelongi Ameghino, 1891 Thylacosmilus lentis Riggs, 1933 Homonyms Thylacosmilus atrox Riggs, 1933