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Temporal range: Triassic, 251.3–221.5 Ma
Ceratites nodosus MHNT.PAL.CEP.2001.105.jpg
Ceratites nodosus Upper Muschelkal - Germany
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ceratitida
Superfamily: Ceratitaceae
Family: Ceratitidae
Subfamily: Ceratitinae
Genus: Ceratites
de Haan (1825)
  • Ceratites beyrichi
  • Ceratites boeckhi
  • Ceratites elegans
  • Ceratites rothi[1]

Ceratites ("Horn Stone") is an extinct genus of ammonite cephalopods. These nektonic carnivores lived in marine habitats in what is now Europe, Asia, and North America, during the Triassic, from Anisian to Ladinian age. [2]


This ammonite has a ceratitic suture pattern on its shell (smooth lobes and frilly saddles). Evolution of the frilly saddles is thought to be due to increased pressure on the shell, at greater depth. The frilly pattern would increase the strength of the shell and allow Ceratites to dive deeper, possibly in search of food.[citation needed]


Fossils of species within this family have been found in the Triassic of Austria, Canada, China, France, Germany, Hungary, India, Israel, Italy, Pakistan, Poland, Russia, Thailand, Turkey and United States. [3]


  1. ^ Triassic ammonoid biostratigraphy: an overview. Marco Balini, Spencer G. Lucas, James F. Jenks and Justin A. Spielmann, Geological Society, London, Special Publications 2010, volume 334, pages 221-262, doi:10.1144/SP334.10
  2. ^ Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopoda
  3. ^ The Paleobiology Database