:Go back to the " Notoungulata " article and under " taxonomy " click on " convergent lines " It's all very well explained . talk ) 14 : 07, 20 April 2011 ( UTC)
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The ancestry of " Notoungulata " also seems less than certain . it would be interesting to know how those who endorsed the Order's talk ) 17 : 18, 20 April 2011 ( UTC)
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"' Notoungulata "'is an extinct order of hoofed, sometimes heavy bodied mammalian ungulates that inhabited South America during the Paleocene to Pleistocene, living from approximately 57 Ma to 11, 000 years ago.
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A 2004 morphological study by In�s Horovitz, focusing on extinct South American ungulates ( such as Notoungulata and Litopterna ), placed " Plesiorycteropus " among tubulidentates and closer to the extinct aardvark relative " Myorycteropus " than to " Orycteropus ".
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However, a close relationship can be worked out to perissodactyls by means of protein sequencing and comparison with fossil collagen from remnants of phylogenetically young members of Meridiungulata ( specifically " Macrauchenia " from the group of Litopterna and " Toxodon " from the group of Notoungulata ).
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The separation of the Litopterna-Notoungulata group from the perissodactyls probably took place before the Cretaceous-Paleogene extinction event . " Condylarths " can probably be considered the starting point for the development of the two groups, as they represent a heterogeneous group of primitive ungulates that mainly inhabited the northern hemisphere in the Paleogene.
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:( Edit Conflict ) Googling on the subject, some authorities have evidently suggested that the Notoungulates originally evolved in East Asia ( as mentioned here ) but there seems to be some debate ( as here ) about whether the sub-orders or families in Asia ( and those in North America ) that have previously been classified within the Order " Notoungulata " are truly members or not.
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