Stephanoceras is recognised by it's unique split ridges at the curve.
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species vanished in the Cretaceous–Paleogene extinction event.
- Carcasa completa de amonita acanalada fina sin matriz
- Periodo geológico
- Jurásico (145.0-201,3 millones de años)
- En buen estado
- 105×80×30 mm
- 233 g