Description
- Perisphinctes sp.
- Late Jurassic Age (160 Million Years Old)
- Near Sakaraha, Madagascar
- Specimen measures approx. 7.5″ wide
- More Ammonite Fossils for Sale
Perisphinctes is an extinct genus of ammonite cephalopod. They lived during the Middle to Late Jurassic epochs and serve as an index fossil for that time period.
Ammonites are an extinct group of marine invertebrate animals similar to the modern nautilus. (Cephalopoda) Like the nautilus, ammonites had a soft body with tentacles that emerged from a hollow chambered shell utilized in the manner of a submarine’s ballast tanks. Ammonites are often identified by their shell ornamentation and the structures of the wall that divide the shell’s chambers.
