Diplobelus

Diplobelus is a genus of belemnite, an extinct group of cephalopods.^[1]

References

↑ Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology. 363: 1–560. Retrieved 2009-04-10.

Notable fossil cephalopods (listed by first occurrence)

Cenozoic

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

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