Ammonitida

Extinct order of molluscs

Ammonitida

Temporal range: Jurassic–Danian

PreꞒ

Parapuzosia seppenradensis
Scientific classification
Domain:  | Eukaryota
Kingdom:  | Animalia
Phylum:  | Mollusca
Class:  | Cephalopoda
Subclass:  | †Ammonoidea
Order:  | †Ammonitida
Hyatt 1889
Suborders

* Ammonitina
* Ancyloceratina
* Lytoceratina
* Phylloceratina

Ammonitida, or true ammonites, are an order of ammonoid cephalopods that lived from the Jurassic through Paleocene time periods, commonly with intricate ammonitic sutures.

Ammonitida is divided into four suborders, the Phylloceratina, Lytoceratina, Ancyloceratina, and Ammonitina.

The Phylloceratina is the ancestral stock, derived from the Ceratitida near the end of the Triassic. The Phylloceratina gave rise to the Lytoceratina near the beginning of the Jurassic which in turn gave rise to the highly specialized Ancyloceratina near the end of the Jurassic. Both the Phylloceratina and Lytoceratina gave rise to various stocks combined in the Ammonitina.

These four suborders are further divided into different stocks, comprising various families combined into superfamilies. Some like the Hildoceratoidea and Stephanoceratoidea are restricted to the Jurassic. Others like the Hoplitoidea and Acanthoceratoidea are known only from the Cretaceous. Still others like the Perisphinctoidea are found in both.

## References

[edit]

Wikispecies has information related to Ammonitida.

* Arkell, W. J.; Furnish, W. M.; Kummel, Bernhard; Miller, A.K.; Moore, R.C.; Schindewolf, O.H. (1957). "Part L, Mollusca 4: Cephalopoda, Ammonoidea". In Raymond C. Moore (ed.). Treatise on Invertebrate Paleontology. Geological Society of America and University of Kansas Press - via Internet Archive.

* Classification of N. H. Landman et al. 2007

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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

Misidentified|

Probable misidentified genera

Nectocarididae: (Nectocaris, Nectocotis)
Kirengellida
Volborthella
Shelbyoceras
Pohlsepia

Taxon identifiers

Ammonitida|

* Wikidata: Q1650384
* Wikispecies: Ammonitida
* iNaturalist: 180410
* IRMNG: 12167
* Paleobiology Database: 84931

Authority control databases |

* Encyclopedia of Modern Ukraine

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