[JimSEA]

That would appear to be a chordate. It's one of the ancestors of vertebrates and thus of us. The Precambrian lead in to the Cambrian explosion was discussed in where new fossil evidence pushed the actual beginning of the "explosion" back some 60 million years thus giving an 80 million year window for the changes. The one thing that makes the early Cambrian so different is the development of exoskeletons and complex eyes. In other words, this was an explosion of mostly bugs and proto fish.

[PapaBear3625]

A 10 percent shift in the age of some event from 530 million years ago, does not advance the case for asserting that everything began in 4004 BC.