Cardioceras is an extinct ammonite genus belonging to the family Cardioceratidae. These fast-moving nektonic carnivores lived during the Jurassic period, Oxfordian age.[2][3]

Description

Shells of Cardioceras species can reach a diameter of 20–25 millimetres (0.79–0.98 in).[4] The shape is circular, with ribs and a prominent ridge along the dorsal edge.[5]

Distribution

Fossils of species within this genus have been found in the Jurassic of France, Germany, Poland, Russia, the United Kingdom[1] and Alaska.[6]

References

  1. ^ a b "Paleobiology Database - Cardioceras". Retrieved 2017-10-19.
  2. ^ Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology. 363: 1–560. Archived from the original on 2008-05-07. Retrieved 2017-10-18.
  3. ^ Mikko's Phylogeny Archive
  4. ^ Cardioceras.ru
  5. ^ Encyclopædia Britannica
  6. ^ Ralph W. Imlay (1981). Late Jurassic Ammonites of Alaska


Allikas: https://en.wikipedia.org/wiki/Cardioceras
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