Apoderoceras
| Apoderoceras Temporal range:
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|---|---|
| File:Apoderoceras FMNH.jpg | |
| Fossil specimen at Field Museum of Natural History | |
| Scientific classification Edit this classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Family: | †Coeloceratidae |
| Genus: | †Apoderoceras Buckman, 1921 |
| Species[2] | |
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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.[3]
Biostratigraphic significance
[edit | edit source]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
[edit | edit source]Jurassic of Argentina, Hungary, Italy, Portugal, the United Kingdom [4]
References
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