"It's a huge gap. And so that big gap got researchers sort of questioning, ‘Is this thing actually an octopus?'" ...

A 300-million-year-old tentacled sea creature has lost its crown as the world’s oldest octopus, after scientists found ...

The ammonoids, an extinct subclass of cephalopods, offer a remarkable window into the evolutionary innovations of marine life. Their coiled, chambered shells and intricate suture patterns record a ...