Asteroceras stellare

Asteroceras stellare, the true star ammonite, is an extinct species of cephalopod belonging to the Ammonite subclass and to the family Arietitidae.

These fast-moving nektonic carnivores lived during the lower Jurassic period, around 196.5 to 189.6 million years ago.

Description
Asteroceras stellare has a shell reaching a diameter of about 90 cm.

Distribution
Fossils of this species may be found in the Jurassic of Germany, Hungary and United Kingdom.