04945 - Stunning Heteromorph Ammonites Acrioceras sp 4.04 Inch Lower Cretaceous Spinosaurus teeth It has been cleaned and

It has been cleaned and prepared to unearth it from its natural carbonaceous matrix

This species is always characterized by 5 to 7 crests

It is exceptionally perfect

24 Inch = 6 mm

It is a magnificent and impressive piece

04945 - Stunning Heteromorph Ammonites Acrioceras sp 4.04 Inch Lower Cretaceous Spinosaurus teeth It has been cleaned andThe Ancyloceratina were a diverse suborder of ammonite most closely related to the ammonites of order Lytoceratina. They evolved during the Late Jurassic but were not very common until the Cretaceous period, when they rapidly diversified and become one of the most distinctive components of Cretaceous marine faunas. They have been recorded from every continent and many are used as zonal or index fossils. The most distinctive feature of the majority of