with the eventual appearance of the lineages of almost all animals living today. This stunning and unique evolutionary flowering is termed the "Cambrian explosion," taking the name of the ...

Researchers Crack Centuries-Old ‘Skeleton’ Mystery With Help of 550-Million-Yr-Old Fossils, Reveal What Ancient Animals Looked ... a phenomenon called the Cambrian Explosion.

The Cambrian Explosion saw an incredible diversity of life emerge, including many major animal groups alive today. Among them were the chordates, to which vertebrates (animals with backbones ...

dramatically. It was the time of the Cambrian Explosion, an eruption of life when Earth’s very first animals began appearing in the fossil record — the ancestors of all major animal groups ...

This nematode is part of the clade Ecdysozoa, the subject of new research on animal nervous ... questions about this mystery. Previously, scientists were unsure exactly how the ventral nerve cord (a ...

ROMIP SPECIMEN 61233 (Bottom) (Right) The mystery of these ... and triggered the Cambrian explosion—there also were changes in ocean chemistry that allowed animals to acquire hard parts (calcium ...