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.

Vertebrates minus tetrapods.

This paraphyletic subgroup is easy to form the "acquatic only" (fishes) vs "things that come out of water" (tetrapods). Though mudfishes make that distinction harder.

Which kind of makes sense, why would you want for limbs unless you are going to stay out of water!

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