Haydenoceras is a genus of middle Devonian cephalopods originally placed in the Barrandeocerida. The genus can be recognized by its strongly compressed, gradually expanding exogastrically curved shell with a strongly rounded dorsum and acutely angled venter, calling attention to the general form of earlier Bassleroceras. The siphuncle is tubular, central.
| Haydenoceras Temporal range: Middle Devonian
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | †Tarphycerida |
| Family: | †Barrandeoceratidae |
| Genus: | †Haydenoceras Flower, 1949 |
Related genera include Avilionella, Barrandeoceras, Gasconsoceras, Laureloceras, and Savageoceras.
References
edit- Walter C. Sweet 1964. Natiloidea - Barrandeocerida, Treatise on Invertebrate Paleontology Part K. Geological Society of America and University of Kansas Press.
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