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Temporal range: Pliensbachian
Uptonia jamesoni ESV.jpg
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Superfamily: Eoderocerataceae
Family: Polymorphitidae
Genus: Uptonia

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


  • Arkell, et al. 1957. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L. Geol Soc of America and Univ Kansas Press. R.C. Moore Ed.
  • Uptonia ignota Photos
  • Uptonia Taxonomy