All these discoveries they are always making using fossils and things like that are not that reliable, it is mostly guess work. There are so many gaps in the things that they know that it is pretty hard to be 100% sure about anything.
I read that if everyone in N-America were to die today, something like 3 humans should statistically become fossils (wich goes to show that people researching it afterwards wouldn't have much to work with). We only know about 2% of the creatures that have walked the earth, and evolution is an ongoing thing, perhaps these ants are just a bit slow.
I personally don't think this has any meaning about anuthing
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