According to Strausfeld, confirmation of this shared ground pattern in the vertebrate hippocampus would suggest that it originated from a very ancient common ancestor likely to have lived about 600 million years ago just before the Cambrian explosion, a relatively short period when most major
animal phyla emerged.
The initial phases of animal evolution proceeded faster than hitherto supposed: New analyses suggest that the first
animal phyla emerged in rapid succession — prior to the global Ice Age that set in around 700 million years ago.
Not exact matches
The fossil record suggests complex multicellular life
emerged about 600 million years ago in a relatively short period termed the «Cambrian explosion,» during which most major
animal phyla appeared.