With 350 million years of evolution culminating in almost two centuries of scientific discourse, a new hypothesis emerges. Researchers propose a new explanation for why ammonoids evolved a highly ...

Though now extinct, ammonoids (a group of marine mollusks with shells) evolved for 350 million years, always with a tendency toward increasingly elaborate shell structures. Scientists have studied ...

April 13 (UPI) --Ammonoids, an ancient group of mollusks, used the wavy lines found inside their shells to fine-tune their buoyancy, according to a new study. Prior to their disappearance at the end ...

Researchers previously focused on the roles of these complex structures in resisting pressure on the shell, but new researchers provide evidence for a different hypothesis. Complex sutures, they found ...

Ammonites are a tale of two textures. The prehistoric cephalopods were composed of fleshy soft tissue (the living bit of the animals) and hard external shells, which, according to a paper published ...

Ammonoids are a group of extinct marine mollusk animals that are now an iconic fossil group often collected by amateurs. Over 350 million years of evolution, ammonoids developed increasingly elaborate ...