[goodusername]

I did a little research on this for a previous post. It appears that saying most animal phyla appeared during the CE is an exaggeration, let alone saying nearly all.

[eastsider]

I did a little research on this for a previous post.

From the end of your previous post:

We now know that life extends back about 3 billion years before the CE. Multicellular life begins well over a billion years before the CE. And we now know that many animal phyla originate prior to the CE.

I'm curious whether there's a period after which we can say that no new phyla have appeared?