Ceratitida

Extinct order of molluscs

Ceratitida Temporal range: Middle Permian - Late Triassic PreꞒ Ꞓ O S D C P T J K Pg N

Ceratites nodosus, Upper Muschelkalk - Germany
Scientific classification
Domain:	Eukaryota
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
- Ceratitoidea
- Choristoceratoidea
- Clydonitoidea
- Danubitoidea
- Dinaritoidea
- Lobitoidea
- Meekoceratoidea
- Megaphyllitoidea
- Nathorstitoidea
- Noritoidea
- Otoceratoidea
- Pinacoceratoidea
- Ptychitoidea
- Sageceratoidea
- Tropitoidea
- Xenodiscoidea

Only eight superfamilies 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.^{[citation needed]}

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

Evolution of
cephalopods

Mesozoic

Advanced nautiloids Nautilaceae True ammonites
Early coleoids Muensterelloidea Proteroctopus Styletoctopus Keuppia Palaeoctopus Paleocirroteuthis Vampyronassa
Ceratitid ammonoids late Nautilida
Advanced belemnoids Diplobelids: Diplobelus Belemnites: Belemnites Belemnopsis Belemnotheutis

Palaeozoic

Earliest unambiguous cephalopods: Plectronocerida: Plectronoceras, Monoplacophora-like form: Knightoconus? First appearance of long-lasting lineages Goniatite and ceratite ammonoids Probable coleoid ancestor Bactritida Early coleoids: Jeletzkya?, Gordoniconus, Syllipsimopodi Earliest belemnoids: Aulacocerids Phragmoteuthids
Early forms the earliest cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida Spirulid?: Shimanskya