Lambeoceras
| Lambeoceras Temporal range: Upper Ordovician
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| Family: | †Lambeoceratidae
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| Genus: | †Lambeoceras Foeste, 1917
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Lambeoceras is an extinct genus of large actinocerids with a convexly lenticular cross section from Upper Ordovician-aged marine deposits of North America and the sole representative of the family Lambeoceratidae.