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Classification of Muizon and McDonald 1995
Or.
Xenarthra
Cope 1889 [edentate]
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Fm. †
Megalonychidae
Gervais 1855
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Subfm. †
Nothrotheriinae
Ameghino 1920
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G. †
Thalassocnus
Muizon and McDonald 1995
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†
Thalassocnus natans
Muizon and McDonald 1995