Cholesterol clinched it: A group of strange Precambrian fossils are among the oldest known animals in the rock record. The finding “gets rid of the more outlandish hypotheses about what these objects ...

The history of a major animal group, composed of millions of species of insects, arachnids, and nemotodes, has been elusive -- until now. A team has now identified the oldest known ecdysozoan in the ...

Researchers led by Nagoya University discover penetrative trace fossils from the late Ediacaran of western Mongolia, revealing earlier onset of the "agronomic revolution" Nagoya, Japan -- In the ...

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 Uncus ...

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 almost ...