Ancyloceras Heteromorph Ammonite (Unfurled) Fossil

Heteromorph ammonites are a type of ammonite that had a shell shape that deviated from the typical coiled shape. Instead, their shells were straight or had a loosely coiled, irregular shape. It had spikes developed to protect itself from fish that started developing armored bony mouths.

Heteromorph ammonites lived during the Mesozoic era, from around 252 to 66 million years ago.

They are considered to be rare compared to coiled ammonites and are often highly prized by collectors and paleontologists. Heteromorph ammonites provide insight into the diversity and evolution of ammonites and the ancient marine environments they lived in.

Self-Standing
1 lbs
6.5x5 inches