Beaniceras
Encyclopedia
Beaniceras is small, coarsely ribbed genus ammonite
from the Lower Jurassic with coarsely ribbed rounded whorls. The shell is evolute, early whorls a barrel-shaped cadicone, later become serpenticonic.
Ammonitida
The Ammonitida is an order of more highly evolved ammonoid cephalopods from the Jurassic and Cretaceous time periods, commonly with intricate ammonitic sutures....
from the Lower Jurassic with coarsely ribbed rounded whorls. The shell is evolute, early whorls a barrel-shaped cadicone, later become serpenticonic.
References
- Treatise on Invertebrate Paleontology, Part L; Ch. Mesozoic Ammonoidea.. Geological Soc of Americia and U Kansas Press, R.C Moore (ed)