Ancestors of cephalopods all had shells until it proved to be their biggest weakness. The ancestors of modern, squishy cephalopods like the octopus and the squid all had shells. In ancient times, ...

The brilliant iridescent hues found in ammolite come from tiny air gaps in the fossils’ layers, a new study finds.

Collecting seashells on the beach may be a fun pastime for many. Looking at the wide variety of shells you can find, you may wonder what creature was living in it before it washed up onshore. But, ...

For the first time ever, scientists have recorded footage of the ram’s horn squid, an enigma whose common shells—really their skeletons!—have belied their vanishing secrecy. In the enchanting video ...

The future is full of tentacles. Even now, both giant and colossal squid writhe throughout the deep, while hooked and flying squid migrate from sea to sea in swirling swarms. Otherworldly glass squid ...

If you’re a beachcomber with a good eye, there’s a chance you’ve spotted a tiny, curled “horn” in the sand. So, what sea creature is it from? Padre Island National Seashore shared a photo Friday of ...

The fossil record is chock-full of the fossilized remains of spiral-shelled ammonoids, whose shapes are reminiscent of rams’ horns. But there was another type of ammonoid with long, straight, uncoiled ...

The oldest ancestor of modern octopuses lived 328 million years ago and had 10 arms, according to a new study. Researchers have named the previously unknown species Syllipsimopodi bideni after US ...

Cephalopod researchers were surprised by the sighting of a ram’s horn squid, a peculiar animal never before filmed in its natural environment. By Sabrina Imbler Earlier this week, and more than 2,700 ...