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Megalonyx (Greek, "great-claw") is an extinct genus of ground sloths of the family Megalonychidae, native to North America.It evolved during the Pliocene Epoch and became extinct at the end of the Late Pleistocene, living from ~5 million to ~13,000 years ago. [3]
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]
Ground sloths are a diverse group of extinct sloths in the mammalian superorder Xenarthra. They varied widely in size with the largest, belonging to genera Lestodon, Eremotherium and Megatherium, being around the size of elephants. Ground sloths represent a paraphyletic group, as living tree sloths are thought to have evolved from ground sloth ...
Tree sloths: Medium-sized folivores specialized for life hanging upside-down in trees; Ground sloths: Medium to very large ground-living herbivores (and possibly omnivores) Aquatic sloths: Thalassocnus, a medium-sized herbivore, is the only known aquatic sloth
Closeup of hand, showing claws Closeup of skull. Megatheriidae is a family of extinct ground sloths that lived from approximately 23 mya—11,000 years ago. [3]Megatheriids appeared during the Late Oligocene (Deseadan in the SALMA classification), some 29 million years ago, in South America.
[29] [30] As a ground-dwelling sloth, it had relatively shorter and stronger limbs compared to modern arboreal sloths and also had a longer tail. [31] Due to its large body size, it is suggested to have been sparsely covered in hair, or alternatively covered in a dense layer of 1 centimetre (0.39 in) thick hair. [32]
Pictures Jefferson's ground sloth: Megalonyx jeffersoni: Alaska to northern Mexico: Most recent remains dated to 9540-9420 BCE. [4] Xibalbaonyx oviceps: Puerto Morelos, Mexico Most recent remains at El Zapote cenote dated to 8697-8355 BCE. [3]
Pictures Cuban sloth [6] Acratocnus antillensis: Cuba: Most recent remains dated to 5050-4050 BCE. [4] Puerto Rican sloth [6] Acratocnus odontrigonus: Puerto Rico [6] Most recent remains dated to 1738–1500 BCE. However this date was not obtained directly from bones, nor calibrated, and the remains could be older. [7] Haitian Macaya sloth [6 ...