 The last Pantodonts died out at the end of the Eocene (around 34 million years ago).Pantodonta include some of the largest mammals of their time, but were a diversified group, with some primitive members weighing less than and the largest more than .The earliest and most primitive pantodonts, "Bemalambda" (with a skull probably the size of a dog) and "Hypsilolambda", appear in the early Paleocene Shanghuan Formation in China.