| Acanthoceras Fossil range: middle Cretaceous |
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Acanthoceras is an extinct genus of cephalopod belonging to the Ammonite subclass and Acanthoceratidae family that lived during the Turonian stage of the middle Cretaceous Period. The Cretaceous (kriːˈteɪʃəs, usually abbreviated 'K' for its German translation "Kreide" is a geologic period and system, reaching from the end of Molluscs are animals belonging to the phylum Mollusca. There are around 250000 extant Species within the phylum with an estimated 70000 The cephalopods ( Greek plural (kephalópoda "head-feet" are the Mollusc class Cephalopoda characterized by Ammonites are an extinct group of marine animals of the subclass Ammonoidea in the class Cephalopoda phylum Acanthoceratidae is an extinct family of Cephalopods belonging to the Ammonite subclass The cephalopods ( Greek plural (kephalópoda "head-feet" are the Mollusc class Cephalopoda characterized by Ammonites are an extinct group of marine animals of the subclass Ammonoidea in the class Cephalopoda phylum Acanthoceratidae is an extinct family of Cephalopods belonging to the Ammonite subclass In Biological classification, family ( Latin The Turonian is a stage of the Late Cretaceous Epoch. It spans the time between 93 The Cretaceous (kriːˈteɪʃəs, usually abbreviated 'K' for its German translation "Kreide" is a geologic period and system, reaching from the end of Their shells had ornate ribs whose function is unknown, although some scientists have speculated that these ribs helped strengthen the animals' shells to allow them to live at greater depths where the water pressure is higher. An adult had a shell diameter of approximately 5 inches. Acanthoceras fossils can be found in Western Europe, western North America and northern Australia.
Species
- A. quadratum
- A. rhotomagense
- A. roguense
References
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