Pantodonta include some of the largest mammals of their time .
Were a diversified group , with some primitive members weighing less than 10 kg ( 22 lb ) and the largest more than 500 kg ( 1,100 lb ) .
Pantodonta include some of the largest mammals of their time , but were a diversified group , with some primitive members weighing less than 10 kg ( 22 lb ) and the largest more than 500 kg ( 1,100 lb ) .