Many Cambrian animals became extinct during the transition to the next geological period, ... Half-a-billion-year-old 3-eyed sea creature dubbed 'Mosura' breathed through big gills on its butt.

Imagine drifting through a prehistoric sea more than 500 million years ago. The water teems with bizarre creatures, ... The Nightmare Shrimp That Ruled the Cambrian Oceans appeared... advertisement.

In places where sea-floor oxygen levels are a bit higher — about 0.5–3% of concentrations at the sea surface — animals are more abundant but their food webs remain limited: the animals still ...

Creatures of Cambrian May Have Lived On. Share full article. 23. 23. By John Noble Wilford. May 17, 2010; ... was confined to the sea — and what is now Canada was just south of the Equator.

Moreover, these newly examined creatures date back to the period that followed the Cambrian, the early Ordovician, 488 million to 472 million years ago, meaning these predators lived for 30 ...

A new study says sea creatures follow a hypothesis called Cope's rule, which states that animal lineages will get heftier as time goes on. Published Thursday in Science, the study finds that the ...

But pinning down the exact origin of these squishy sea creatures, which are some of the earliest complex animals, is difficult. They rarely show up in the fossil record because jellyfish are 95 ...

An ancient buglike sea creature with a fan-shaped tail and a carapace that wrapped around its body swam upside down and looked like a taco — but this taco could bite back. Newfound fossils of ...