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Within the Megatheriidae there are two (possibly three) subfamilies; the Megatheriinae and the Planopsinae. The phylogenetically older group is represented by the Planopsinae from the Lower and Middle Miocene.
The group includes the heavily built Megatherium (given its name 'great beast' by Georges Cuvier [4]) and Eremotherium. An early genus that was originally considered a megatheriid, the more slightly built Hapalops, reached a length of about 1.2 metres (3.9 ft). The nothrotheres have recently been placed in their own family, Nothrotheriidae. [5]
A number of kill sites are known for ground sloths in the Americas, these include Campo Laborde in the Pampas of Argentina, where an individual of Megatherium americanum was butchered at the edge of a swamp, dating to approximately 12,600 years Before Present (BP), [63] with another potential Megatherium kill site being Arroyo Seco 2 in the ...
Promegatherium ("before Megatherium") is a genus of prehistoric xenarthrans that lived in Argentina, during the Late Miocene.This genus is regarded as closely related to the later, and more famous genus, Megatherium, hence the reference in the name.
The humerus widened considerably downwards and measured between 13.6 and 16.2 cm at the end of the joint (elbow joint). The ratio of the lower width to the total length of the bone thus corresponded approximately to that of Megatherium and was significantly larger than in Pyramiodontherium and Megatheriops. Most of the other long bones are ...
Nothrotheriops is a genus of Pleistocene ground sloth found in North America, from what is now central Mexico to the southern United States. [1] This genus of bear-sized xenarthran was related to the much larger, and far more famous Megatherium, although it has recently been placed in a different family, Nothrotheriidae. [2]
Lisowicia compared to a human. The plant-eating dicynodont Lisowicia bojani is the largest-known of all non-mammalian synapsids, at about 4.5 m (15 ft) long, 2.6 m (8 ft 6 in) tall, and 9,000 kg (20,000 lb) in body mass.
Eremotherium laurillardi skeleton at the Smithsonian National Museum of Natural History. Eremotherium was slightly larger than the closely related Megatherium in size, reaching an overall length of 6 metres (20 ft) and a height of 2 metres (6.6 ft) while on all fours, possibly up to 4 metres (13 ft) when it reared up on its hind legs. [25]