Genus Mylodon is an extinct genus of ground sloths that lived around 1 million years ago in South America. There are several synonyms for the word "Genus Mylodon," such as Mylodon darwini, Mylodon harlani, and Mylodon listai. These synonyms refer to different species of the same genus. Mylodon darwini was the first species to be described, named after Charles Darwin who discovered its fossils in Patagonia. Mylodon harlani was named after Richard Harlan, an American naturalist who studied the species. Mylodon listai was named after the paleontologist called Alberto Lesta, who first identified it. Despite being synonyms, each species had its own unique characteristics and lived in different areas of South America.