Ammonitida

Ammonitida Temporal range: Jurassic–Cretaceous PreЄ Є O S D C P T J K Pg N
Parapuzosia seppenradensis, the largest known ammonite (diameter 1.8 m)
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida Hyatt 1889
suborders
Phylloceratina Lytoceratina Ancyloceratina Ammonitina

The Ammonitida is an order of more highly evolved ammonoid cephalopods from the Jurassic and Cretaceous time periods, commonly with intricate ammonitic sutures.

The Ammonitida are 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 Hildocerataceae and Stephanocerataceae are restricted to the Jurassic. Others like the Hoplitaceae and Acanthocerataceae are known only from the Cretaceous. Still others like the Perisphinctaceae are found in both.

References

• Arkell, et al., 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L, Ammonoidea. Geol Soc of America and Univ. Kansas press. R.C. Moore (Ed).
• Classification of N. H. Landman et al. 2007

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

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