Ceratitida Ceratites nodosus Upper Muschelkal - Germany Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: †Ammonoidea Order: †Ceratitida
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.
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.
- 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) CenozoicThe belemnite-cuttlefish-like Belosaepia
Evolutionary history of cephalopods
- 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
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