Uptonia
Encyclopedia
Uptonia is an extinct ammonite
from the Lower Jurassic that's included in the eoderoceratacean
family Polymorphitidae.
The shell of Uptonia is evolute with rounded simple ribs that form strong chevrons as they cross the venter on the outer rim, and which are free of tubercles. Some grew to be fairly large. The suture is ammonitic, complex, with large lateral lobes
Ammonite
Ammonite, as a zoological or paleontological term, refers to any member of the Ammonoidea an extinct subclass within the Molluscan class Cephalopoda which are more closely related to living coleoids Ammonite, as a zoological or paleontological term, refers to any member of the Ammonoidea an extinct...
from the Lower Jurassic that's included in the eoderoceratacean
Eoderocerataceae
Eoderocerataceae is a superfamily of true ammonites from the Lower Jurassic, comprising seven phylogenetically related families, characterized in general by having ribbed evolute shells that commonly bear spines or tubercles...
family Polymorphitidae.
The shell of Uptonia is evolute with rounded simple ribs that form strong chevrons as they cross the venter on the outer rim, and which are free of tubercles. Some grew to be fairly large. The suture is ammonitic, complex, with large lateral lobes