The Evolution and Extinction of Sloths and Anteaters Across Eons

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This article examines the evolutionary history and extinction patterns of sloths and anteaters from the Cretaceous to the Pliocene eras. It explores key species such as Bradypus, Choloepus, and Myrmecophaga, and discusses significant geological changes, including the Bolivian crises and Incaic uplift episodes. The impact of tectonic shifts and eustatic fluctuations on the fossil record and climate trends will be analyzed, providing insights into how these factors influenced the survival and adaptation of these unique mammals over millions of years.

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Mar 18, 2014

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The Evolution and Extinction of Sloths and Anteaters Across Eons

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65 61 49 37 16 11 5 2 0 55 34 29 24 Cretaceous Paleo. Eocene Oligo. Miocene Pli. P. E L E M L E L E M L Sloths Bradypus 6 Choloepus 11 Cyclopes Anteaters 9 Tamandua 4 Myrmecophaga 12 D. kappleri 3 D. novemcinctus Armadillos Priodontes 10 7 Cabassous 5 Tolypeutes 8 Chaetophractus 2 Euphractus 1 Zaedyus 1st major Bolivian crisis 2nd major Bolivian crisis Incaic uplift episode TECTONIC CRISES EUSTATIC CURVES Temp. (°C) 12 Partial Partial Full scale Full scale Antarctic ice sheet 8 4 0 long term 250 200 150 low - stand short term 100 50 0 m low + stand E L E M L E L E M L Cretaceous Paleo. Eocene Oligo. Miocene Pli. P. 65** 61 49 37 16 11 5 2 0 55 34 29 24

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