Thylacoleo origins issue: now both sides of the argument are correct
If you keep pounding on a nail
sooner or later it will become flush with the surface of the wood.
In the present context,
that means if you work on the mammal subset of the LRT for a year and a half you’re bound to someday arrive at a solution to the phylogeny of mammals.
That day is today (I hope). Here in the large reptile tree (LRT, 2342 taxa) a revised cladogram appears to resolve earlier issues.
http://reptileevolution.com/reptile-tree.htm
On the topic of Thylacoleo origins
the LRT still nests Thylacoleo and Wakaleo with didelphids – BUT following these two taxa the LRT nests members of the Apaemyidae and Diprodonta. Does that resolve the issue?
Now monodelphids follow tiny Ambolestes.
Now didelphids are derived from smaller monodelphids, rather than the other way around. Now monodelphids nest basal to the several marsupial-to-placental transitions anticipated by Wortman 1902.
Wortman 1902 was first: Three origins for placental mammals hypothesis
Of course,
this remains a hypothesis on interrelationships. Work continues.
Apologies for the lack of links and images,
but the WordPress image and linking issues continue. I cannot access the images file, so I cannot edit old ones out. At present I am also unable to upgrade my account. Either WordPress will realize their mistake (as they did previously) or I will access through other means. Thank you for your patience.
Source: https://pterosaurheresies.wordpress.com/2025/11/29/thylacoleo-origins-issue-now-both-sides-of-the-argument-are-correct/
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