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Megalocnus Fossil range: .126–.011 Ma Late Pleistocene |
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| Mounted
skeleton of Megalocnus rodens American Museum of Natural History, New York City |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Superorder: | Xenarthra |
| Order: | Pilosa |
| Family: | Megalonychidae |
| Genus: | †Megalocnus Leidy, 1868 |
| Species | |
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The ground sloths of the extinct genus Megalocnus ("Great Sloth") were among the largest of the Caribbean ground sloths, with individuals estimated to have weighed up to 90 kg (200 lb) when alive. Two species are known, M. rodens of Cuba, and M. zile of Hispaniola. Subfossils of M. rodens indicate survival well into the Holocene, prompting speculation that they may have survived in the montane forests of the Cuban highlands until the 15th or 16th century. However, the most recent AMS radiocarbon date reported is 4190 BP, calibrated to c. 4700 BP.[1] This is similar to the most recent date reported for a Hispaniolan sloth, 4391 BP, calibrated to c. 5000 BP, for the small and probably arboreal Neocnus comes,[2] and some 1200 years after the earliest known date for human occupation of Cuba, 5140 BP, calibrated to c. 5900 BP.[1]
Their relatives include other Caribbean ground sloths, such as Acratocnus, Mesocnus, Miocnus, Neocnus, Parocnus, and Paulocnus.
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Cladus: Eukaryota
Supergroup: Unikonta
Cladus: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Classis: Mammalia
Subclassis: Theria
Infraclassis: Placentalia
Superordo: Xenarthra
Ordo: Pilosa
Subordo: Folivora
Familia: Megalonychidae
Genus: †Megalocnus
Species: M. rodens - M. zile
Megalocnus Leidy, 1868
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