Ammonites were swimming molluscs in the dinosaur age, and now we have found a fossil of one without its distinctive spiral shell – perhaps because it was attacked by a predator
Source:
https://www.newscientist.com/article/2265570-strange-fossil-is-the-first-to-show-an-ammonite-without-its-shell/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home