roughbarked said:
roughbarked said:
Don’t know why but I can’t connect to that Toxodon image link.
and I am having trouble connecting where Toxodon fits into this cladogram https://en.wikipedia.org/wiki/Metatheria
That’s because its origins are brand new and based, interestingly, on the genetics not of DNA but of collagen.
http://www.abc.net.au/science/articles/2015/03/19/4200730.htm
Ever since Darwin first collected the fossils about 180 years ago, scientists had been baffled about where these odd South American beasts, that went extinct just 10,000 years ago, fit on the mammal family tree.
The mystery has now been solved. Researchers undertook a sophisticated biochemical analysis of bone collagen extracted from fossils of the two mammals, Toxodon and Macrauchenia, and demonstrated that they were related to the group that includes horses, tapirs and rhinos.
Their results are published today in the journal Nature. “We have resolved one of the last unresolved major problems in mammalian evolution: the origins of the South American native ungulates”.