1 giug 8000 anni a. C. - Extinction of mastodons and another megafauna
Descrizione:
Giant ground sloth (Megatheriinae) is the common name for several species of large bodied mammals (megafauna) who evolved and lived exclusively on the American continents. The superorder Xenarthrans--which includes anteaters and armadillos--emerged in Patagonia during the Oligocene (34-23 million years ago), then diversified and dispersed throughout South America. The first giant ground sloths appeared in South America at least as long ago as the late Miocene (Friasian, 23-5 mya), and by the Late Pliocene (Blancan, ca. 5.3-2.6 mya) arrived in North America. Most of the large forms died out during the late Pleistocene, although there is recently discovered evidence of ground sloth survival in central America as recently as 5,000 years ago.
There are nine species (and up to 19 genera) of giant sloths known from four families: Megatheriidae (Megatheriinae); Mylodontidae (Mylodontinae and Scelidotheriinae), Nothrotheriidae, and Megalonychidae. Pre-Pleistocene remains are very sparse (except for Eremotheriaum eomigrans), but there are lots of fossils from the Pleistocene, especially Megatherium americanum in South America, and E. laurillardi in both South and North America. E. laurillardi was a large, intertropical species known as the Panamanian giant ground sloth, who may well have survived into the late Pleistocene.
Read more:
https://www.thoughtco.com/giant-ground-sloths-in-the-americas-170883
Aggiunto al nastro di tempo:
World History - Human History by Fabiola Suarez
A short view of the most remarkable events in human life.
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