Ceratitida

Ceratitida Temporal range: Late Permian - Late Triassic PreЄ Є O S D C P T J K Pg N
Ceratites nodosus Upper Muschelkal - Germany
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ceratitida Zittel, (1884)
Superfamilies
see text

Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Upper Permian, the exception being the phylloceratids which gave rise to the great diversity of post Triassic ammonites.

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 uncoiled. Sutures are typically ceratitic, with smooth saddles and serrate or digitized lobes. In a few the sutures are goniatitic while in others they are ammonitic.

Taxonomy

• Ceratitida
  • Ceratitaceae
  • Choristocerataceae
  • Clydonitaceae
  • Danubitaceae
  • Dinaritaceae
  • Lobitaceae
  • Meekocerataceae
  • Megaphyllitaceae
  • Nathorstitaceae
  • Noritaceae
  • Otocerataceae
  • Pinacocerataceae
  • Ptychitaceae
  • Sagecerataceae
  • Trachycerataceae
  • Tropitaceae
  • Xenodiscaceae

Only eight superfamlies are shown in the Treatise on Invertebrate Paleontology, Part L,(1957), the 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.

References

• Arkell et al., 1962, Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology part L, Mollusca 4, Ammonoidea. R.C. Moore (ed)
• Paleobiology Database

Notable fossil cephalopods (listed by first occurrence) Cenozoic The belemnite-cuttlefish-like Belosaepia Evolutionary history of cephalopods Mesozoic Advanced nautiloids Nautilaceae True ammonites Early coleoids Proteroctopus Styletoctopus Keuppia Palaeoctopus Paleocirroteuthis Ceratitid ammonoids late Nautilida Advanced belemnoids Diplobelids: Diplobelus Belemnites: Belemnites Belemnopsis Belemnotheutis Palaeozoic First appearance of long-lasting lineages Goniatite and ceratite ammonoids Probable coleoid ancestor Bactritida Earliest belemnoids: Aulacocerids: Aulacoceras Phragmoteuthids: Phragmoteuthis Early forms the earliest cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida Spirulid?: Shimanskya Octopus Pohlsepia Cambrian Earliest unambiguous cephalopods: Plectronocerida Plectronoceras Monoplacophoran-like ancestral forms: Knightoconus Possible, nude, "stem-group cephalopods": Nectocarididae