So for Google Earth Day's quiz I ended up being a "Pangolin." Turns out I had no idea what it was so I looked into it and honestly it reminded me a lot of an Armadillo. So I decided to find out the difference between the two, and I stumbled across this site.
It was all making sense until I got to the "bullet points" at the bottom where I saw this
Pangolin is a mammal while armadillo is a placental mammal.
And I'm now very confused. I thought placental mammal was just a subset of mammals. And I look up Pangolin's taxonomy and now I'm seeing all kinds of stuff I have no idea how to interpret. Back in my day, it was "Kings Play Cards On Fat Green Stools" for "Kingdom Phylum Class Order Family Genus Species". And now I'm seeing things like clade, infraclass, subcohort, superorder and all kinds of things I just don't get.
So I guess I have many questions, but I'm going to boil it down to "If the Pangolin isn't considered a placental mammal, then what kind of mammal is it, and where does it diverge in taxonomy from the Armadillo?"
Oh, and if someone could point me to a primer on the changes to taxonomy in the last 20 years, that'd be cool too.