- Ceratitida
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Ceratitida 
Ceratites nodosus Upper Muschelkal - Germany Scientific classification 
Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: †Ammonoidea Order: †Ceratitida
Zittel, (1884)Superfamilies see text
The 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 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.
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): 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 cephalopodsMesozoic - 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
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