- Didymoceras
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Didymoceras
Temporal range: 83.5–70.6 Ma Upper CampanianD. stevensoni, D. nebrascensis, and D. cheyennese Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Suborder: Ancyloceratina
Wiedmann, 1966Superfamily: Turrilitaceae Family: ?Didymoceratidae Genus: Didymoceras
Hyatt, 1894Species D. platycostatum
D. stevensoni
D. nebrascense
D. saxonicum
D. cheyenneseSynonyms Helicoceras
Emperoceras
DidymoceratoidesDidymoceras ("Paired Horns") is an extinct genus of ammonite cephalopod. It is one of the most bizarrely shaped genera, with a shell that spirals upwards into a loose, hooked tip. It is thought to have drifted in the water vertically, moving up and down.
Its taxonomic place is often in flux, being placed in either Turrilitidae, Nostoceratidae, or its own family, "Didymoceratidae."
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