This ancient fossil worm may be the progenitor of all animals, a new study suggests.
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This 380-million-year-old fish had five "fingers" in its pectoral fins, showing that fish developed fingers before making the move to land.
A billion years ago, this green seaweed likely produced oxygen and provided shelter for other organisms.
Fossils discovered in Nevada contain preserved guts from a mysterious creature that lived 550 million years ago.
New evidence of preserved brain tissue from the Cambrian period counters arguments that nervous tissue cannot be fossilized.
Scientists reveal more mysteries about the bizarre Tully Monster, an ancient sea creature with stalked eyes that has defied classification.
Trilobites fossilized in Morocco seem to have been buried by a storm as they marched in an orderly queue.
An ancient relative of spiders and scorpions had a tank-like body with bulging eyes, a spiky shield on its butt and a head like a multitool.
The face of the oldest known species of Australopithecus looks a bit like the famous "Lucy" and a bit like far older hominins.
These fossils could show the life-forms that gave Earth its earliest whiffs of oxygen, but not everyone is convinced.
Miners digging for gemstones found something entirely different last month; the fossilized remains of an ancient sea monster.
Paleontologists have discovered the remains of an ancient Loch Ness Monster look-alike in freezing Antarctica. And just like the legendary Nessie, it wasn't the runt of the litter.
Baby fish swam in schools 50 million years ago, according to this remarkable fossil held in a Japanese museum.
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