Adkinsia

Adkinsia is an extinct genus of cephalopod belonging to the Ammonite subclass.

Adkinsia Temporal range:
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Flickiidae
Subfamily:	†Flickiinae
Genus:	†Adkinsia Boes, 1928

References

Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.

Notable fossil cephalopods (listed by first occurrence)

The belemnite-cuttlefish-like Belosaepia

Evolution of
cephalopods

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

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

Earliest unambiguous cephalopods: Plectronocerida
- Plectronoceras
Monoplacophoran-like ancestral forms: Knightoconus
Possible, nude, "stem-group cephalopods": Nectocarididae

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