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 appearing in the fossil ...

The creature’s distinctive shell ... the Palau nautilus highlights the need for continued research and conservation efforts to protect this remarkable species. As a “living fossil,” it ...

Fossils of them are found all around the world ... We think it’s more likely that ammonites would have had eight arms rather than lots of tentacles like a nautilus, though the shell is more similar to ...

Based on the fossil record, ammonites came in a wide range of sizes and shapes, from smaller than an inch to as large as nine feet wide. Some ammonites had long, straight shells, while others had ...

The half-cut shell of the modern Nautilus (right). 3D-printed half-cut ammonite shell (left). Chamber model from the current study, cut to show internal geometry (top). Disclaimer: AAAS and ...