The Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic
The Triassic is a geologic period and system that extends from about 250 to 200 Mya . As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic. Both the start and end of the Triassic are marked by major extinction events...

 as well as ancestral forms from the Upper Permian
The PermianThe term "Permian" was introduced into geology in 1841 by Sir Sir R. I. Murchison, president of the Geological Society of London, who identified typical strata in extensive Russian explorations undertaken with Edouard de Verneuil; Murchison asserted in 1841 that he named his "Permian...

, the exception being the phylloceratids
The Phyllocertina comprise a suborder of ammonoid cephalopods, belonging to the Ammonitida, whose range extends from the Lower Triassic to the Upper Cretaceous...

 which gave rise to the great diversity of post Triassic ammonites
The Ammonitida is an order of more highly evolved ammonoid cephalopods from the Jurassic and Cretaceous time periods, commonly with intricate ammonitic sutures....


Ceratitids overwhelmingly produced planospirally coiled discoidal shells that may be evolute with inner whorls exposed or involute with only the outer whorl showing. In a few later forms the shell became subglobular, in others, trochoidal or uncoilded. Sutures are typically ceratitic, with smooth saddles and serrate or digitized lobes. In a few the sutures are goniatitc while in others they are ammonitic.


  • Ceratitida
    • Ceratitaceae
      The Ceratitaceae is a superfamily in the ammonoid cephalopod order Ceratitida characterised in general by highly ornamented or tuberculate shells with ceratitic sutures that may become goniatitic or ammonitic s some offshoots....

    • Choristocerataceae
    • Clydonitaceae
      The Clydonitaceae is a superfamily in the ammonoid cephalopod order Ceratitida characterized by generally costate and turberculate shells with smooth, grooved, or keeled venters and sutures that are commonly ceratitic or ammonitic but goniatic in a few offshoots.-Taxonomy:The Clydonitaceae unites...

    • Danubitaceae
      AmmonoideaThe Danubitaceae is a large and diverse superfamily in the Order Ceratitida of the Ammonoidea that combines five families removed from the Ceratitaceae, Clydonitaceae, and Ptychitaceae.- Taxonomy:Superfamily Danubitaceae* Fam. Aplococeratidae...

    • Dinaritaceae
    • Lobitaceae
    • Meekocerataceae
    • Megaphyllitaceae
    • Nathorstitaceae
    • Noritaceae
      Noritaceae is an extinct superfamily of cephalopods belonging to the Ammonite order Ceratitida.The Noritaceae, defined by Karpinsky in 1889, combines ceratitids with "typically smooth, more or less discoidal shells with rounded or truncate peripheries and ceratitic sutures,...." Keeled or ribbed...

    • Otocerataceae
      Otocerataceae is an extinct superfamily of ammonite cephalopods in the order Ceratitida.-References:* Accessed on 9/24/07...

    • Pinacocerataceae
      The Pinacocerataceae are generally smooth, compressed, evolute to involute ammonoids from the Triassic, belonging to the Ceratitida, in which the suture is ammonitic, with adventitious and auxiliary elements....

    • Ptychitaceae
      The Ptychitacheae is a superfamily of typically involute, subglobular to discoidal Ceratitida in which the shell is smooth with lateral folds or strigations, inner whorls are globose, and the suture is commonly ammonitic...

    • Sagecerataceae
    • Trachycerataceae
    • Tropitaceae
    • Xenodiscaceae
      The Xenodiscaceae is a superfamily within the ammonoid order Ceratitida. The Xenodiscaceae, named by Frech in 1902, presently contains ten families, only one of which was included in the original Otocerataceae of Hyatt, 1900, the remaining having been added.The Xenodiscaceae has its origin in the...

Only eight superfamlies are shown in the Treatise on Invertebrate Paleontology
Treatise on Invertebrate Paleontology
The Treatise on Invertebrate Paleontology published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and covering every phylum, class, order, family, and genus of fossil and...

, Part L,(1957): Otocerataceae, Noritaceae, Ceratitaceae, Arcestaceae, Clydonitaceae, Lobitaceae, Ptychitaceae, and Tropitaceae, in text sequence. The other 10 have been added since, derived from within the original eight.
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