Board Thread:Off Topic/@comment-25396609-20150910235150/@comment-25396609-20151005192800

Shadow at Morning wrote: Phantom: You say "most often". Surely you mean always? Because the development of the notochord and then the spine was a pretty big fucking deal evolutionarily. Not a thing a lower clade can be split on in subtaxa. They'd be a different clade entirely, on another MRCA branch. I was going to type always but for some reason my brain kept saying "i think there are a couple in different groups"