1) Extinct ground sloths 2) Family megatheriidae 3) Mammal family 
Megatheriidae is a family of extinct ground sloths that lived from approximately 23 mya—11,000 years ago, existing for approximately {Mya|23-0.11|million years}. Megatheriids appeared later in the Oligocene, some 30 million years ago, also in South America. The group includes the heavily built Megatherium (given its name `great beast` by Georg.....
[n] - extinct ground sloths
family Megatheriidae noun extinct ground sloths