The many chambers of their shells likely helped these cephalopods glide through the planet’s warm, shallow seas. A thin, tubelike structure called a siphuncle pumped air through the interior ...

The chambered, or pearly, nautilus (Nautilus pompilius) is a charismatic cephalopod species known for its exceptional spiraling, chambered shell. It belongs to a family that has barely changed since ...

Cephalopods were among the first predatory animals to hunt in the ancient seas. They evolved more than 500 million years ago—long before fish got going—from a small animal with a shell like a ...

Ammonites were shelled cephalopods that died out about 66 million years ago. Fossils of them are found all around the world, sometimes in very large concentrations. The often tightly wound shells of ...

If there was a prize for the world’s strangest cephalopods, we’re pretty sure argonauts would win. Need convincing? Well, first they make a weird ‘shell’ that isn’t technically a shell. Second, they ...

This year, the Institution collected everything from the stunning shell of an extinct cephalopod to a Blue Origin rocket booster Roger Catlin Museums Correspondent One of the ceremonial double ...

How can the soft bodies of coleoid cephalopods so aptly hide in their environment? Why must they? What cells and specialized organs make such crypsis possible for one of the older evolutionary ...

But there's undeniably something special about cephalopods—the class of ocean-dwelling invertebrates that includes cuttlefish, squid and octopus. Critics offer many arguments against raising ...