Precambrian time covers the vast bulk of the Earth's history, starting with the planet's creation about 4.5 billion years ago and ending with the emergence of complex, multicelled life-forms ...

Despite being the largest and most diverse group of animals on the planet, ecdysozoans have long posed a mystery for scientists due to the absence of clear fossil evidence of their early ancestors, ...

even though molecular studies suggested they existed during the Precambrian period. In a recent study published in Current Biology, researchers introduced Uncus dzaugisi, a 555-million-year-old ...

More extensive Precambrian finds ... that skeletonized creatures of the Cambrian period, long thought by scientists to be the first multicellular animals, had predecessors. Debate continues ...

It has long been suspected that the sparseness of the pre-Cambrian fossil record reflects ... Recent research suggests that the period prior to the Cambrian explosion saw the gradual evolution ...

A 555-million-year-old fossil found in South Australia provides crucial evidence for the Precambrian origins of Ecdysozoa, which encompasses insects, crustaceans, and nematodes. The discovery of ...