Ciro Santilli @cirosantilli 37

Name origin: amnion, a pellicle that covers embryos of both eggs and also during pregnancy.

Includes:

Does not include amphibians. If you include them, you have the tetrapods.

When a characteristic is basal, it basically means the opposite of it being polyphyletic.

E.g. monotremes laying eggs did not evolve separately after function loss, it comes directly from reptiles.

It is quite mind blowing that this is polyphyletic on mammals and birds, what can't parallel evolution achieve??

The weirdest mammal clade: they lay fucking eggs. Only 5 known species alive as of 2020.

Eggs are basal: they simply didn't evolve out of what other reptiles do. From which we conclude that milk came before eggs stopped.

So this is the most basal subclade of mammals.

Etymology: means "single hole" in Greek, because like other reptiles it has a single hole for shit, pee and fucking: the cloaca.

All non-clade groups are evil. All non-clade terms must be forgotten. Some notable ones:

Mammals and a bunch of extinct animals that look more like mammals than reptiles.

TODO name: Wikipedia says "being with a fused arch" but what does that mean???

Includes:

The exact relationships between those clades is not very clear as there's a bunch of extinct species in the middle we are not sure exactly where they go exactly, some hypothesis are listed at: en.wikipedia.org/w/index.php?title=Tetrapod&oldid=1053601110#Temnospondyl_hypothesis_(TH)

But at least it seems rock solid that those three are actually clades.