Apoderoceras
{{Short description|Genus of molluscs (fossil)}}
{{Automatic taxobox
| fossil_range = {{fossil range| Pliensbachian|ref={{cite web
| last = Sepkoski| first = Jack| title= Sepkoski's Online Genus Database| year = 2002| url = http://strata.geology.wisc.edu/jack/showgenera.php?taxon=231&rank=class| accessdate = 2014-05-28 }}}}
| image = Apoderoceras FMNH.jpg
| image_caption = Fossil specimen at Field Museum of Natural History
| taxon = Apoderoceras
| authority = Buckman, 1921
| subdivision_ranks = Species
| subdivision = {{Species list
| {{extinct}}Apoderoceras antiquum | Lóczy, 1915
| {{extinct}}Apoderoceras dunrobinense | Spath, 1926
| {{extinct}}Apoderoceras ferox | Buckman, 1925
| {{extinct}}Apoderoceras sparsinodum | Quenstedt, 1849
| {{extinct}}Apoderoceras subtriangulare | Young and Bird, 1822
}}
| subdivision_ref = {{fossilworks |id=14567 |title=Apoderoceras |date=29 April 2022}}
}}
Apoderoceras is an extinct genus of cephalopod belonging to the ammonite subclass.
Ammonites (Apoderoceras) were predatory mollusks that resembled a squid with a shell. These cephalopods had eyes, tentacles, and spiral shells. They are more closely related to a living octopus, though the shells resemble that of a nautilus. True ammonites appeared in the fossil record about 240 million years ago. The last lineages disappeared 65 million years ago at the end of the Cretaceous.https://www.fossilera.com/fossils/huge-13-spiny-jurassic-ammonite-apoderoceras-fossil-england
Biostratigraphic significance
The International Commission on Stratigraphy (ICS) has assigned the First Appearance Datum of genus Apoderoceras and of Bifericeras donovani the defining biological marker for the start of the Pliensbachian Stage of the Jurassic, 190.8 ± 1.0 million years ago.
Distribution
Jurassic of Argentina, Hungary, Italy, Portugal, the United Kingdom {{cite web | title= Paleobiology Database| year = | url = https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=14587| access-date = 17 December 2021 }}