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Temporal range: Sinemurian[1]
Ammonite Asteroceras.jpg
Asteroceras fossil from Dorset, England.
Asteroceras BW.jpg
Illustration of Asteroceras species
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Family: Arietitidae
Genus: Asteroceras
Hyatt, 1867

Asteroceras is an extinct genus of cephalopod belonging to the Ammonite subclass. These fast-moving nektonic carnivores lived during the Triassic and Jurassic periods (from 205.6 to 189.6 Ma). [2]




Asteroceras fossils may be found in the Jurassic marine strata of Canada, China, Germany, Hong Kong, Hungary, Peru, and Turkey, in the Triassic of United States and at Lyme Regis in the Asteroceras obtusum zone of Upper Sinemurian age.[4][2]


  1. ^ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28. 
  2. ^ a b c Paleobiology Database - Asteroceras. 2014-05-29.
  3. ^ Biolib
  4. ^ Martell, D. M. 1995. An Ichthyosaur with Preserved Soft Tissue from the Sinemurian of Southern England. Palaeontology. 38(4): 897-903